NOBO - A fake server for Back Orifice. When someone attemps to connect to you, they will get a warning message (which can be anything you like) and it will log their ip and the exact time of the attempted connection.
Netbuster - A fake server for Netbus. Many options. Allows someone to connect to you but does not allow him to alter anything or view anything that you don't let him. You can really have some fun with this.
Anti Sub 7 Server - A fake server for Sub 7. Many options.
Sub 7 Killswitch - Another fake server for Sub 7. Much simpler than the one above.