These little devices are great for building and great for learning one in the same.
But with Onion Pi you can build one for a Tor Proxy

Tor

Tor is free software for enabling anonymous communication. The name is derived from an acronym for the original software project name "The Onion Router".

Feeling like snooping? with out detection well this little guy can assist you with this.

Just don't do anything stupid with it.

weekend you can build a project that uses a Raspberry Pi B+, a USB WiFi adapter and Ethernet cable to create a small, low-power and portable privacy Pi.

Trust me when I say this will be fun to create. Picking one up today. I will share my results.