just a script that i have been playing with, the purpose of which is to "tile" all windows from the front application.
It's useful when u need to view several windows at the same time. for example when u r doing multiple window chatting using ichat or other chatting programs, or comparing two editor windows from the script editor.

Applescript:

--tile windows of frontmost applications in a grid
--this script is useful for
--multiple window chatting
--working side by side of several windows of the same app

--make need to make it as a stay open application later
--for now assume that it is opened and closed per invokation

on run {}
   local a
   set userscreen to my getUserScreen()
   
   --display dialog (getFrntApp() as string)
   try
       set applist to getFrntApp()
       if length of applist = 0 then
           return
       end if
       set a to item 1 of getFrntApp()
   on error
       return
   end try
   
   try
       tileScriptable(a, userscreen)
   on error
       tileUnscriptable(a, userscreen)
   end try
   
end run

on tileScriptable(a, screen)
   local i, c
   set i to 1
   tell application named a
       set theWindows to every window of application a whose visible is true and floating is false and ¬
           modal is false -- and miniaturized is false
       set c to count theWindows
       if c = 0 then
           return
       end if
       set tiles to calTileBounds(c, screen, 1)
       repeat with theWindow in theWindows
           --tileScriptableWindow(a, theWindow, {0, 22, 1024, 728})
           my tileScriptableWindow(a, theWindow, item i of tiles)
           set i to i + 1
       end repeat
       
   end tell
   
end tileScriptable

on tileUnscriptable(a, screeninfo)
   -- unscriptable app
   local i, c
   set i to 1
   tell application "System Events"
       set theWindows to (every window of application process a)
       set theWindows to my filterUnscriptableInvisible(theWindows)
       
       set c to count theWindows
       
       if c = 0 then
           return
       end if
       
       --display dialog screeninfo as string giving up after 5
       set tiles to my calTileBounds(c, screeninfo, 1)
       repeat with theWindow in theWindows
           --display dialog (class of visible of theWindow)
           my tileUnScriptableWindow(a, theWindow, item i of tiles)
           set i to i + 1
       end repeat
       
   end tell
end tileUnscriptable

on filterUnscriptableInvisible(ws)
   -- filter out from ws windows that are docked    
   set newws to {}
   set docklist to getNamesDocked()
   --display dialog (docklist as string)
   repeat with theWindow in ws
       if name of theWindow is not in docklist then
           set end of newws to theWindow
       end if
   end repeat
   
   --display dialog (count newws)
   return newws
end filterUnscriptableInvisible

on getNamesDocked()
   tell application "System Events" to tell process "Dock"'s list 1
       set l to name of UI elements whose subrole is "AXMinimizedWindowDockItem"
   end tell
   
   return l
end getNamesDocked

on tileScriptableWindow(a, w, bound)
   tell application a
       set bounds of w to bound
   end tell
end tileScriptableWindow

on tileUnScriptableWindow(a, w, bound)
   tell application "System Events"
       --display dialog (count position of w)
       set AppleScript's text item delimiters to " "
       
       set position of w to {(item 1 of bound), (item 2 of bound)}
       
       set size of w to {(item 3 of bound) - (item 1 of bound) - 5, ¬
           (item 4 of bound) - (item 2 of bound) - 5}
       --display dialog (count properties of w)
   end tell
end tileUnScriptableWindow


on calTileBounds(c, screen, direction)
   -- return a list of lists of window bounds
   -- a simple tile algo that tiles along direction (current only 1=horizontal)
   
   local maxgridx, maxgridy, nrow, ncolumn, irow, icolumn
   set {maxgridx, maxgridy} to {3, 3}
   set {x0, y0, w0, h0} to screen
   set ret to {}
   -- case 0: c <= maxgridx. tile them beautifully!
   if c ≤ maxgridx then
       set {nrow, ncolumn} to {1, c}
       set {wgrid, hgrid} to {(w0 / c as integer), h0}
       
       repeat with icolumn from 1 to c
           set itile to {x0 + (icolumn - 1) * wgrid, y0, x0 + (icolumn - 1) * wgrid + wgrid, y0 + hgrid}
           --set itile to {x0 + (icolumn - 1) * wgrid, y0, wgrid, hgrid}
           --set item 3 of itile to ((item 1 of itile) + (item 3 of itile))
           --set item 4 of itile to ((item 2 of itile) + (item 4 of itile))
           set end of ret to itile
       end repeat
       
       return ret
   end if
   
   --case 1: maxgridx<c<= maxgridx*maxgridy. tile them in maxgridy rows, but gracefully on the last row
   if c ≤ maxgridx * maxgridy then
       set temp to (c div maxgridx)
       if 0 ≠ (c - (temp) * maxgridx) then
           set {nrow, ncolumn} to {temp + 1, maxgridx}
       else
           set {nrow, ncolumn} to {temp, maxgridx}
       end if
       --???
       set {wgrid, hgrid} to {((w0 / ncolumn) as integer), (h0 / nrow) as integer}
       repeat with irow from 1 to nrow - 1
           repeat with icolumn from 1 to ncolumn
               set itile to {x0 + (icolumn - 1) * wgrid, y0 + (irow - 1) * hgrid, x0 + (icolumn - 1) * wgrid + wgrid, y0 + (irow - 1) * hgrid + hgrid}
               --display dialog item 3 of itile as string
               --set itile to {x0 + (icolumn - 1) * wgrid, y0, wgrid, hgrid}
               --set item 3 of itile to ((item 1 of itile) + (item 3 of itile))
               --set item 4 of itile to ((item 2 of itile) + (item 4 of itile))
               set end of ret to itile
           end repeat
       end repeat
       
       set nleft to (c - (nrow - 1) * ncolumn)
       
       set wgrid to (w0 / nleft)
       
       repeat with i from 1 to nleft
           set itile to {x0 + (i - 1) * wgrid, y0 + (nrow - 1) * hgrid, x0 + (i - 1) * wgrid + wgrid, y0 + (nrow - 1) * hgrid + hgrid}
           
           set end of ret to itile
       end repeat
       
       return ret
       
   end if
   
   --case2 : c> maxgridx*maxgridy. no tile at all. put all windows to {0,22,800,600}
   if c > maxgridx * maxgridy then
       
       repeat with icolumn from 1 to c
           set itile to {x0, y0, 800, 600}
           set end of ret to itile
       end repeat
       return ret
   end if
   
   
end calTileBounds



on getFrntApp()
   tell application "System Events" to set frntProc to ¬
       name of every process whose frontmost is true and visible ≠ false
   return frntProc
end getFrntApp

on getUserScreen()
   -- size of menubar takes up wmenu=1024 hmenu=22
   tell application "System Events"
       set {wMenu, hMenu} to size of UI element 1 of application process "SystemUIServer"
       set dockApp to (application process "Dock")
       set sizeDock to size of UI element 1 of dockApp
       --display dialog (item 1 of sizeDock as string) & " " & (item 2 of sizeDock)
       set posDock to position of UI element 1 of dockApp
       --display dialog (posDock as string)
   end tell
   -- size of the full screen
   (*
   {word 3 of (do shell script "defaults read /Library/Preferences/com.apple.windowserver | grep -w Width") as number, ¬
       word 3 of (do shell script "defaults read /Library/Preferences/com.apple.windowserver | grep -w Height") as number}
   *)
   set wScreen to 1024
   set hscreen to 768
   
   --determine the userscreen origin and size
   
   --case 0: bottom dock
   if ((item 2 of posDock) + (item 2 of sizeDock) = hscreen) then
       set wuser to wScreen
       set hUser to hscreen - hMenu - (item 2 of sizeDock)
       set xUser to 0
       set yUser to hMenu
       return {xUser, yUser, wuser, hUser}
   end if
   
   --case 1: hidden dock
   if (item 1 of posDock < 0) then
       set wuser to wScreen
       set hUser to hscreen - hMenu
       set xUser to 0
       set yUser to hMenu + 1
       return {wuser, hUser, xUser, yUser}
   end if
   
   --case 2: left dock
   if (item 1 of posDock = 0) then
       set wuser to wScreen - (item 1 of sizeDock)
       set hUser to hscreen - hMenu
       set xUser to (item 1 of sizeDock) + 1
       set yUser to hMenu + 1
       return {xUser, yUser, wuser, hUser}
   end if
   
   --case 3: right dock
   if ((item 1 of posDock) + (item 1 of sizeDock) = wScreen) then
       set wuser to wScreen - (item 1 of sizeDock)
       set hUser to hscreen - hMenu
       set xUser to 0
       set yUser to hMenu
       return {xUser, yUser, wuser, hUser}
   end if
   
   
end getUserScreen