Enter Wonder How To, a website that did for DIY video guides what Yahoo! did for the early Internet: it categorizes thousands of free how-to videos from over 1,700 websites into 35 categories (from arts & crafts to disaster preparation, magic & parlor tricks to pranks & cons).
I'm currently browsing the How to Hack section, which has over 600 videos on how to hack your gadgets, computers, and even video game consoles. Many of the videos are duds - which is why Wonder How To lets its viewers sort the clips by grade (from A to F).
For example (links open in a new browser/tab)
How to Hack An Elevator to Go Directly To Your Floor
How to Make A Blu-Ray Laser Phaser
How to Construct a WiFi Super Antenna
How to Make a USB Fan Out of Old CDs