I use a Chef's Choice Model 130 Professional electric knife sharpener for my kitchen knives, and it works superbly well for my pocket knives. I've turned many a friend's crappy knife into a good cutter with little effort. The upper level pro models are even better, but you'll pay for them.
If you like the manual approach and want ridiculously sharp knives that you can literally shave with, supplement your sharpening stones with 4000 or 5000 and 8000 grit stones from Naniwa or Norton. Take a note from the straight razor world if you want something really sharp.