Tile Windows

I have searched and searched for a script to tile at least two windows from DIFFERENT applications with no luck so far. If anyone knows of anywhere I can find one, it would be appreciated. I can’t use expose for my purposes because I have to be able to click and perform actions in a window while still viewing the other; in expose, this will just bring the clicked window to the front. Thanks.

Aan important feature missing in Macs. I’ve been searching for a long time. Hope some finds a trick.
Meanwhile have a look at this : http://discussions.apple.com/thread.jspa?messageID=6831712