How a video game light gun works…
Ever wonder how that Duck Hunt gun worked with your old NES? Here’s how – “Lots of home video games and arcade games use some sort of gun as an input device. You point the gun at the screen and pull the trigger, and if you hit the target on the screen, the target explodes. To create this effect, the gun contains a photodiode (or a phototransistor) in the barrel. The photodiode is able to sense light coming from the screen. The gun also contains a trigger switch. The output of the photodiode and the switch are fed to the computer controlling the game.” [via] Link.
Matt writes “Strangely aesthetically pleasing window blinds made out of junk mail. By affixing strips of junk mail to an existing set of venetian blinds, one can drastically reduce the amount of light allowed through without losing the ability to raise and lower the blinds. In my case, about three months’ worth of junk mail, but your mileage will vary. Your trusty roll of duct tape (color to suit). Two rolls of scotch tape. A ruler. A spool of uninsulated wire. A pair of needle-nosed pliers. A thumbtack. Space to work.” 
Great LEGO project, I’m hoping they release the code – “Introducing GameByEmail’s Dice-O-Matic. Made from Legos, a USB camera, and a bit of software, it’s a home-grown, dice-rolling monster. Don’t let it’s rickety looks deceive you; this puppy can easily crank out the 20,000 rolls a day consumed by GamesByEmail. In fact, at full speed it averages almost one roll a second, well over 80,000 a day!.” [
Learn how to tie stopper, hitches, loops and bend knots – great videos! “This is a site about knots: how to tie them, how to appreciate their beauty. Even the seriously knot-challenged among us can learn to tie many useful and popular knots by following along with the short, step-by-step instructional video clips on this site.” 
Here’s another iSight tripod – Steve writes “My dad is a master deal finder. Over the thanksgiving holiday, I traded him a broadband router for this super nice pro camera tripod that he located for $6.95 at his local Salvation Army store. The only thing it was missing was any way to mount a camera.. a problem I’m sure I can rectify with an inexpensive solution from a camera store, or an even less expensive solution from my garage. While my camera’s in the shop, I figured I can use it for a really great iSight tripod.”