This is my first post in 2006, so let me say Happy New Year to everybody, first.
The most used light during the day, for short bursts and identification either indoor and outdoor, is a very handy SF E1e/Z57/KL1 (Ubin, 300 mA with NX05) powered from a RCR123. I swap the battery every morning, so I always have about two hours of runtime.
The beam is perfected to give a balance of spill and thow.
Second most used, the SF U2. Third, Arc-AAA-P. Fourth, PT EOS.
At night, while driving, I have the M3T/MN15/Z58 handy, soon to be replaced from Z3/KT2/N2/Z59 (black) that I like more for the round beam and the color.
Anthony