Yes, I know it's an ad but it's just too damn cool not to share. Sugru, hackers' favorite silicone-based hardening clay, has innumerable uses to enhance, repairs or improve your favorite... well, anything. Yesterday the company released this promotional video showing off what can be done when it's combined with the world's most popular building block. I have no idea what I would do with it, but I want a ton of the stuff.
Instructables user hanlin_y did the math and realized that alkaline batteries are one of the most expensive forms of power that consumers can use. So he/she/it came up with a solution to power your parts even if they don't come with an AC adapter. With a wall plug, wires, and bamboo strips you can run your electronics off the grid; saving money and the environment at the same time.