"Back in the day"(tm)

I used to do initial forensics and network security for some 'interesting' networks. One time I got a call from a network admin telling me they had a cracked machine but they couldn't figure out the attack, apparently, the attack was from an insider, and they were still trying to track down who the IP belonged to.

I flew to the site, started my investigation (after much remote investigation to make sure I wasn't flying for stupidity), and to make a long story short, we found out that an external machine had popped a network printer and then had used the network printer to pop other machines.

Moral: Just because it's a printer, don't disregard it. It has an OS, Harddrive, and network capabilities too.