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.
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.
Last week I issued a challenge to design a book lamp like boutique ones made by Typewriter Boneyard but for a fraction of the cost. Lo and behold, user Richard made a beauty. Using three used books and light fitting parts found at a DIY store, he built this model with two hours of spare time and less than £15. A tip of the hat to you sir for putting together such an impressive (and functioning) model.