Kippo is an incredibly easy to set up SSH Honeypot. The only trouble I had was that it (quite rightly) won't run as root so you can't run it directly on port 22. This is solved by IPTables:
iptables -t nat -A PREROUTING -i eth0 -p tcp –dport 22 -j REDIRECT –to-port 2222
Command from another Kippo blog post.
Results to follow!