I second the endorsement for the DX light, Byrd. I have dozens of them. The first day I had one I accidentally left it in my pants pocket and ran it thru the washer and dryer- it still worked! They're pretty bright for the size and the batteries are removable (although replacements generally cost more than the light). The huge plus of this light is the constant-on switch. I utterly refuse to purchase a light that lacks this feature.

Many times over the years one of these little "faux-tons" has saved the day. Once a coworker had a flat tire at night, and was parked at the far end of the parking lot where there was zero light. No one had a flashlight of any kind! It turns out there was a cheapo D-cell in the office but the batteries were corroded and dead. My little DX light was plenty adequate to change the tire and get him on his way.