As are many here, I'm a bit of a flashlight junkie.

I really like the Maratac 9290 AA Tactical Flashlight from CountyComm that Izzy recommended a while back. It's quite robust, has a useful range of brightness, and good runtime. While not cheap, it's a good value at $33.95. Only downside is it's a little big and does not have a pocket clip. They do sell a holster for it, if that works for you. I EDC this light on a regular basis.

On a whim, I ordered a Nkoray K-106 Cree Q5-WC 5-Mode 230-Lumen Memory LED Flashlight (1*AA/1*14500) for $13.99 from DealExtreme. I must say, I'm very impressed with this light. I don't even notice it's there when clipped to my pocket - I often sleep with it clipped to my pajama bottoms for late-night trips around the house. I know some folks don't trust stuff from DealExtreme, but this light seems well made, has variable brightness, and puts out a lot of light from a small size when you want it. Amd it's cheap.

I power all my AA lights with Duracell low-discharge rechargables bought at Costco.