Pwnie Express' stealthy sequel to the Pwn Plug ships with a Debian 6 instance of Linux whose handy hacking tools are as easy to launch as they are tough to detect.
The hacker doesn't even need to be in the same ZIP code to crack a firewall or VPN -- the 3G link lets the Power Pwn take bash command-line instructions through SMS messages and doles out some of its feedback the same way.