I wrote about mine a little while back (LedLenser) so won't rehash it.

We're spoiled for choice these days with some excellent value for money available. I tend to look for CREE LED's where possible and have found the in some of the cheaper variants which generally means decent light and a reasonable lifespan.

I have headlamps all over the place, in my vehicles, go-bags, hunting and culling kits and generally just hanging about - I tend to leave the old ones on a hook in various locations for when I beed. The hands-free benefit is so handy. :)