I've got the single speed buzz right now. I have my new mtn. bike http://forums.teamestrogen.com/showthread.php?t=4601, and am turning my old bike into a single speed. It should be ready in the next week or so.

Everyone I know loves it, they all seem to feel more peaceful when they are on their single speed. I've also seen amazing fitness improvements from people on their singlespeeds. My hubby used the single speed to train for our mtn. bike tour this past summer and he kicked butt! I look forward to giving it a try and am excited to take a new look at mtn. biking from the singlespeed perspective.

Next step, fixed gear mtn. bike (ok, I don't think I'll get to that point, a little too scary for me). http://www.63xc.com/faq/faq.htm#whytake

I hope your single speed experience goes well!