Hmmmm, the Opalec NewBeam gives you 10 hrs or so of runtime, efficiently uses batteries that would otherwise be considered "dead" in other lights, has that little red LED that says, "Hey these cells are really almost history, time to change them out!"...not "real bright" but provides a nice flood for up close work...
There's the
Tektite LT-1 that uses a 3mm (or ground down 5mm?) LED along with the standard MiniMag/Brinkmann reflector to allow focusing...not bad, works GREAT in candle mode! Fits an AAA MiniMag as well and can run off of a single AA cell (MiniMiniMag modded host).
I've not seen the
TeraLux MiniStar 2 (Luxeon plug in) yet, but it looks promising and I certainly want to check one out!