Cocoa gestures by bitart consulting:
Cocoa Gestures adds mouse gestures to any Cocoa program such as Mail, Address Book, iCal, TextEdit, Chimera, Omniweb and many others.
I’ve switched from Mozilla to Chimera, one of the things I missed at first was optimoz, this should restore (most of) that goodness.
I’ve just set Mail to mark as junk when I draw a J. Chimera goes home if I draw a small letter H. I like that stuff. It seems to do what it says on the tin. Haven’t lived with it for long but looks like it’s been Done Right.