There are many interesting things you can do with a Raspberry Pi, but this one offers privacy protection from prying eyes. All you need is a Raspberry Pi, a Wi-Fi adaptor and some time.
The folks over at Adafruit Industries sent this project over to us from their Adafruit Learning System project site. You'll need a Raspberry Pi (the Model B with 512MB of RAM works best for this), a case for it, an ethernet cable, a Wi-Fi adaptor, an SD card and a few other components — hit the link below to see them all at the project page (and to buy them from Adafruit, if you want). Raspbian is the linux distribution of choice in this case. Once you have it installed and set up, all you have to do is install Tor and launch it.
When you're done, simply connect to the new "Onion Pi" wireless network you'll have created, and you'll be browsing anonymously via Tor. Remember, Tor isn't perfect, and it's designed for anonymity, not security. This project is similar to setting up a Tor relay using a Raspberry Pi, but you're building the server yourself for your own use in this case, so it's an entry point to the network for all of your devices, rather than a relay for everyone else to use. Hit the link below to read more and check out the step-by-step guide.
Onion Pi [Adafruit Learning System]