I love hardware hacks and this one is exceptionally cheap, so all the better. It involves hacking an Actiontec modem/router to act as a linux based SMB honeypot. And ironicaly the linked page has used a honeypot shaped lamp as a case for this project.
The main part for this mod is an Actiontec modem/router which you can pick up for about $60 US
http://froogle.google.com/froogle?q=actiontec+dual+modem+router&btnG=Search+Froogle after that just follow the instructions at jarv.nu
If you have a regular “full sized” linux box you could use something like honeyd and get some added functionality on your network honeypot.