Needs a lot of work before being useful!
I tried this with 3 windows (Safari, System Preferences, and Finder) on the screen and found the following behaviour:
If you drag the Safari window to the edge of the screen it snaps into place like Windows 7. Sometimes. If you have previously moved the Finder or System Preference window it will not snap no matter how much you try (unless you let go of the window, making the previous window you moved the Safari one then try it again and it will work).
The complete opposite is true for the Finder window. It will ONLY work if Finder or System Preferences was the last window to move, and will not work if Safari was the last window to move.
If thats not enough, it will not work with a dual monitor setup. Once you drag a window off the the edge of the screen it will snap back to the side of the first window.
Completely useless for everyday use! I gave it 2 stars because the odd time it works, it seems to work fairly well.
neurotik about
iSnap, v1.6