I EDC a Fenix LD01 ... it runs on a rechargeable AAA and has three brightness levels and none of the strobing features (features that, IMHO, are worse than useless). It runs for about an hour on high and for a lot longer on the lowest setting. It twists on-off so it isn't a tactical light, but it does fit nicely in my pocket and I am NEVER without light when I want it. I got the stainless one (a little more $$$), but the aluminum ones are also nice. For more info than you probably want, see the Candle Power Forum ...
Saands