Build your own metal detector…
“BFO (beat frequency oscillator) metal detectors use two oscillators, each of which produces a radio frequency. One of these oscillators uses a coil of wire that we call the search loop. The second oscillator uses a much smaller coil of wire, and is usually inside the control box and is called the reference oscillator. By adjusting the oscillators so their frequencies are very nearly the same, the difference between them is made audible as a beat note, this beat note changes slightly when the search loop is moved over or near to a piece of metal.” Link.
“A small wireless battery powered device – Turn it on near a friendly wireless network that contains iTunes shares and plug your headphones in. It picks a random iTunes share, picks a random tune and starts playing. Repeat until bored or the batteries are dead. The size of the system is amazing. The main board is about the size of my little finger. By default it’s running an ssh server, a web server and advertising itself to the network with bonjour.” 
Robotsrule writes “I have made a new video to show some of the capabilities of the new, upcoming version 3 of Robosapien Dance Machine, the free open source program that lets Windows PC users create complex scripts to control their robots, and control their robots using just their voice. This 1 minute 3 MB video demonstrates the support that version 3 of Robosapien Dance Machine will have, for all of WowWee’s robots; including the Robosapien V1, Robosapien V2, Robopet, and Roboraptor robots.” [
You can find these old digital microscopes on eBay for under $20. Here’s a blog that catalogs some of what you can see with them – “Last week, I got myself a toy I’ve wanted to play with for many years — the Intel Play QX3 Digital Microscope. When I was a kid, the old medical microscope my parents bought for me at a garage sale was my favorite toy. I would spend hours putting whatever I could find underneath it… and now, with the digital microscope, I’m doing it again as an adult. I am adding new pictures every day and will continue to do so until I run out of things to look at with the microscope”… [
Awhile back we made our 
Here’s a midnight post from Kevin Rose who has a great track record with what usually is announced at Macworld: “I’ve heard: 15″ intel Macbook – order tomorrow, ships Feb (thinner, dual core), iPod FM receiver, iWork/Life ’06, New remote of some type, Photocasting (iPhoto)” 
