Czech glass artist Michal Zahradnik> designed this all-glass steam engine, which he claims is fully operational and can run at 500rpm. Some of his other creations include a model plane and Harley-style motorcycle. All I know is the sound this thing makes is going to haunt my dreams.
3 U Penn students developed the µWave (microwave, get it?), an Arduino based kitchen hack that plays Youtube videos while you wait for noms. Once you set the cooking time the program goes to Youtube and finds a highly-rated video for the exact length. Read more about it at the project's website.