+1 to pretty much most of what ken said.

this is my fifth year on fixed and i've tried everything for stopping from resisting 80gis to skipping 59 and back. currently, my model is 67gi with resistance as my primary method with some skipping thrown in for fun (admit it: it's fun) -- and to take some pressure off my aging knees -- and a front brake for those "yikes!" moments (and those moments get increasingly rare -- the last one was july).

lower gi is, of course, the key. with practice, you can get your spin ramped up enough that 67 or even lower doesn't put too big a dent in your speed and the payoff in control makes it worth it.