Control your world with your Pi without programming. This Instructable shows you how to use a simple affordable extension board named PiFace on top of the Raspberry Pi to control the world around you, without any technical skill.
Raspberry Pi Multi-Room Audio (Mobile/Tablet/PC Controlled)
Turn Your Rice Cooker Into an Arduino-Powered, DIY Sous Vide Machine: This project turns an inexpensive rice cooker into a precision cooking instrument capable of maintaining cooking temperatures within C.
Build Your Own Vertical-Axis Wind Turbine On The Cheap - Didn't realize vertical wind turbines existed. The scale of this one and the fact that it supposedly doesn't require gale force winds to produce power makes it definitely worth looking into.