Originally Posted by moxfyre

Well, I personally use Suntour Bar-con *friction* shifters. Some consider them the best bar-ends ever made, $10 at a swap meet

If you have a good cassette and derailers, friction shifting is easy as pie, and no adjustments ever.

Also, Sheldon Brown sez that 8-speed bar-ends work pretty well with 7-speed: http://sheldonbrown.com/harris/shifters.html (makes sense since the cog spacing is very close, 5.0 mm for 7-speed vs. 4.8 mm for 8-speed).