MONOCHRON - open source retro clock from adafruit industries on Vimeo.
They call it something else (for understandable reasons), but it still satisfies our grumpy old geek rant: “When we were kids, video games had two lines and a dot, and we LIKED IT THAT WAY!”
Hardware hacker “Ladyada” has released an open source retro arcade style table tennis for two clock called the MONOCHRON. According to MONCHRON project page they “wanted to make a clock that was ultra-hackable, from adding a separate battery-backed RTC to designing the enclosure so you could program the clock once its assembled.” It includes a ATmega328 processor (with’Arduino’ stk500 bootloader for easy hacking). It’s completely open source hardware, all firmware, layout and CAD files are yours to mess with.