Adafruit Pi Cobbler Breakout Kit for Raspberry Pi - Now that you've finally got your hands on a Raspberry Pi® , you're probably itching to make some fun embedded computer projects with it. What you need is an add on prototyping Pi Cobbler from Adafruit, which can break out all those tasty power, GPIO, I2C and SPI pins from the 26 pin header onto a solderless breadboard. This mini kit will make "cobbling together" prototypes with the Pi super easy. $7.95
Kali is a great tool for testing the security of your network and the operating system works on just about everything that can run Linux. That includes the Raspberry Pi. What's even better is a new distribution that brings along support for a touchscreen.