I'm kicking myself because this version has been out for a year and a half and it took me until today to find it.

I've been using a Kensington Expert Mouse, which I love. The Kensington Mouseworks software, however, destroys some functionality of Leopard and has been a thorn in my side since the release of Leopard.

Steermouse restores all the features of Leopard without the glitches of Mouseworks. My only complaint is that Steermouse doesn't handle chording of buttons. Perhaps in another version?