I added up most of people's favorites so far. Might have skipped some, but this is just to get a general feel for which mice the thread's raving about:
G500 Family: 17
MX Family: 17
CM Storm Family: 11
Intellimouse Family: 9
Mionix 5000: 3
Zowie Family: 3
QPAD 5K: 2
M500 Family: 2
Single mentions: CST Trackball, DT225, Imperator, MS Natura 6000, OCZ Equalizer, R2 Mk III Omnimouse, Salmosa, Spectre, Trackball Explorer, War Mouse
Razer and Logitech seem like the current industry leaders, but Cooler Master and Steelseries are quite popular as well. I think some lesser-known mice are also pretty interesting (Mionix, Zowie, QPAD, A4Tech, V7, etc).
A lot of those preferences are based on personal needs and criterias such as shape, intended use (MMOs, shooters, work), and this list mixes old favorites with the newest technology. All of those mice seem to have some interesting features.