Wireless optical mouse are pretty damn sweet although I can perhaps see its lack of functionality in the workplace and it's penchant for trouble in a school environment but at home I love it. I use the Logitech Elite Mouse
A good solid mouse all-around with roughly 3 weeks of battery life on normal alkilines (of course ive been using PureEnergy rechargables which normally give 2 weeks of use except these batteries have been recharged 100+ times so ... back to alkalines). I think this is the last (wireless at least) mouse made by logitech that didnt feature "useless" buttons (i.e., on the MX series of mice, there are those obscure "dot buttons" where you have to contort your fingers into painful configurations to press
)
On the other side, Microsoft wireless mice (or at least some of them), have a really kewl feature in that they only require one battery two run so I could use them with my dead PureEnergies hehe.