HMM..wonder why there are more fixie cultists talking about fixies than ss cultists talking about SS....its just plain more fun...period. The suppossed disadvantages to riding fixed are really just additional challenges for folks who want to make their ride more interesting.
I ride geared, SS, and fixed. Frankly, the geared bike bores the hell out of me for commuting. The SS is great on the singletrack, but I don't find it all that exciting on the road. The fixie makes road riding more challenging and interesting. My commute is 8 miles one way, and riding it fixed (with hills) actually makes it an exciting ride, and more of a workout. It may be an obsolete technology, but so are things like sailboats, black powder rifles, vintage cars and what not...yet people still use them for various reasons, mostly for fun, nostalgia, the challenge, whatever. Theres really no point in arguing against it...we all recognize that fixed gear riding has certain elements that can either be interpreted as disadvantages or additional challenges.
Anyway, to get back to the positive aspects of SS..my favorite part of singlespeeding is not the low maintenence or any kind of Zen feeling. Its really just all about the feeling of using 1 gear to whip the arses of my MTB buddies who ride geared bikes.