And ~tl. They no longer use APE. it is redesigned, so it's safe to install it. It says so in the briefing when you go to install it.

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Ah, that's good to know! I'm more than happy with USB Overdrive though as it lets me configure all the buttons and I'm supporting an indie Mac developer by using it. The only thing it doesn't let me do is turn on/off the ratchet on the clickwheel on a per application basis... but... meh...