StickDuino is a completely open source custom USB stick for an Arduino. If you've ever wanted to learn how to interface Arduino to USB or Build a PCB for your Arduino, this is a great place to start.
The DIY laptop is probably one of the most novel yet seemingly useless projects I've seen in a while. If nothing it's just fun to look at and see what one man can create now-a-days compared to decades ago.
This is little mod lets you see the keyboard in pitch black. My IBM thinkpad actually has an LED like this built into it, however it's no where as near as bright as what this guy did.