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I bought a Razer DeathAdder for Mac and I'm loving it. I've also used Logitech MX Rev. for a while and those are great as well.

But I'm a gamer, so. It's great for work too though, but you gotta game to take full advantage.
 
I would suggest getting the Logitech MX revolution. It's a bit up there in price, but it's worth it.

The MX revolution is a decent mouse but I think it's a bit to bulky as a notebook mouse.. If you wanna carry your mouse around you might wanna consider the VX revolution or VX Nano.
 
The only thing about Logitech wireless mice is that they can have a few problems with OS X, particularly when you're using an application to map their buttons to commands, like USB Overdrive, Steermouse, or ControllerMate. I find that you sometimes have to disconnect and reconnect the USB receiver after unlocking the machine—if you don't, your cursor loses its "weight": it can't trigger hover events.
 
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