Possible Duplicate:
How to I get window drop functionality on Mac OS X?
I really like using the drag-n-drop feature on Windows 7. (Drag a window to the edge of your screen to auto-fill half the screen, drag it to the top to fill the entire screen.)
Is there an easy way to get this feature on machines running any other OS's? I'm specifically wondering about Mac OSX, but would love to know about a Windows XP solution too...