[RussianCow]

It might very well support the behavior that I'm looking for (the trial doesn't seem to work so I can't tell for sure), but I don't see anything in the description about snapping to other windows. It sounds like you set some pre-defined snapping sizes/areas, and those are used. Please correct me if I'm wrong.

[heed]

BetterTouchTool has the same functionality as the snap tool baked in, and it's free!

(In preferences look at "Action Settings" in the advanced tab).

http://www.bettertouchtool.net/