Using a small Dell BlueTooth mouse that is similar to the Dell WM524 "Travel Mouse". Works fine, but I removed the ratchet click spring from the mouse wheel because I like a free-rolling wheel. I also have a few wired Logitech optical mice, all have the ratchet click spring removed from the wheel.
I also have the Magic Mouse and I use it occasionally, but I find it gives me hand strain after an hour. This mouse is too low, and the click buttons require too much pressure. Also this mouse does not move very smoothly on most surfaces I tried, it seems too have too much friction from the mouse feet and that makes it hard to make small precise movements. It's a cool mouse in concept but the design needs some tweaking to make it feel more comfortable.