there's a pretty happenin fixie scene out here in seatown, you won't be disappointed! (although you might have to change your gearing a bit to get up n' over some of the hills around here)

definitely check out the .83 forum to get in touch w/ local riders.

critical mass is 5:30 PM @ westlake center, last friday of every month.

and if you're into track racing, there's the maymoor velodrome! (just outside of seattle, within riding distance)