Apple's Mighty Mouse is unusable junk but looks stylish. This 80 € cordless laser mouse with both automatic and manual "transmission" in its top wheel has quite good ergonomics, but as a friend of minimalistic design I loathe extra buttons, leds and other unnecessary junk. Logitech's drivers for OS X are also totally and ridiculously unusable trash (this is supposed be fixed in a few weeks when OS X Leopard comes available, but I wouldn't hold my breath).
Fortunately, this mouse performs perfectly in GNU/Linux and is completely configurable (at least for hardcore UNIX users) so it's the best compromise at the moment. Once again GNU/Linux rocks.
(Nokia N80 picture.)