Unfuddle's free accounts only allow 1 project and 2 users. Which is a bummer, because I really liked Unfuddle's interface, but I'm not gonna commit to a monthly service until we actually have revenue. :-(
And unfuddle only allocates 200mb, which is easy to hit pretty quick. Looks like assembla is offering 2gb, but none of the ticketing tools or other services... Unfuddle does those things really well on the free account.