I like the Tactikka and had used one for a couple of years, but early this year I got two headlamps from Mammut that I like even better; the Lucido TR-1 for general use and the TX-1 for mountaineering and winter. I've retired the Tactikka to my BOB as a backup, and use these others exclusively now for outdoor activities.

They take standard AAA and AA batteries and have a really long battery life for the amount of light they pump out. The TX-1 is super-bright on its high setting, but both are good for hiking or trail running. They swivel to adjust where the beam points and have positive lock-outs for keeping them off in a pack or pocket. Finally, they start on the low setting rather than the high, which I really like (most headlamps seem to do the opposite).

http://www.rei.com/product/775033

http://www.rei.com/product/775029