Cool stuff in here :)
I try to get underground at least once a month so I'm always trying to keep up with cool stuff in the flashlight world.
Petzl Duo 14. The halogen bulb on the side is rather worthless, but the main LED array is amazing. Puts out a nice, even flood. Three regulated brightness levels. Waterproof. Takes 4AAs.
Fenix HP10. This thing is insanely bright on the highest setting. Puts out more of a spot compared to the flood on the Petzl light. Waterproof. Takes 4AAs. I think it's been replaced by the HP11.
Princeton Tec Impact XL. 65 lumens, 50 hours runtime on 4AAs. Waterproof.
Princeton Tec Attitude. 30 lumens, 150 hours runtime on 4AAAs. Waterproof.
I also have a not so fancy Utilitech 9 LED flashlight. 75 lumens, 10 hours, 3AAAs. Seems to be well built for $15.
Eneloops are my favorite rechargeables. Specs for the AAs- 2000mAH, precharged, low self discharge, and they can be recharged 1500 times. I used them in all my caving lights, our digital camera, Wii remotes, my son's RC car, and so on.