I'll put a plug in for Doug Ritter's customized Photon Freedom micro light. I've carried one for about three months now and I really really like it.

It is tiny - much smaller than the AAA Arc. I didn't even notice a change in the pocket volume.

It is powerful enough to do what I need and always there when I need it. To be honest I was shocked by how much light comes out of this tiny thing.

The extra black collar around the LED bulb does a GREAT job of keeping the bright light from shining back into my eyes. Some may think the isn't such a big deal, but when it is real dark out I find myself very sensitive to back-light (a real problem I've experienced with some semi-transparent cases used by Princeton-Tec flashlights).

The yellow color makes it easy to distinguish it among the keys, and though it is applied to the surface of the plastic, it has yet to scratch off. Being banged around all day along-side keys this light takes quite a beating, but you'd think it was brand new. This little thing is tough!

The logic behind diming (important for conserving battery time) and using the special features (I don't use them much) is pretty darn natural. I'll have to admit that when I first got it I was concerned that I'd have to memorize the manual, but it turned out to be easy to learn.

The only real drawback is that it doesn't use more common AAA or AA batteries, but those would make it too big to fit comfortably in my pocket alongside all the other stuff, and besides I don't use the light for long periods of time, only when caught without a flashlight.

I really like those little yellow lights.