Today I rode my "new" Xtracycle home from the LBS. This is the 1991 Bridgestone MB-4 that I found on Craigslist for $60 last month (when a bunch of us had a run of buying old rigid MTBs).
I added albatross bars, bar end shifters, and a Brooks saddle. After tweaking the fit a bit, I think I'm going to have fun with this bike. It's definitely a conversation piece--I stopped for lunch on the way home, and a woman started talking to me about it and came outside to check it out.