HOW TO – Build a PCB router
Jonathan designed a great printed circuit board router, he writes – “Printed circuit boards are usually manufactured by chemical etching (with iron (III) chloride or ammonium persulfate, for example). This is not very practical if only a few boards are necessary, because these etchants are messy and somewhat dangerous. PCBs can also be manufactured by “mechanical etching,” in which a trace is “etched” by milling away the copper along its perimeter. This requires software to generate a toolpath from the layout and a small CNC mill or router. Lots of companies make routers for PCB fabrication, but they are unjustifiably expensive so I decided to build one.” Link.
Here’s another great how to on converting an ATX power supply to a lab power supply, Abizar writes “Computer power supplies are US$15 but lab power supplies are US$100+. By converting the cheap (free) ATX power supplies that can be found in any discarded computer you can get a phenomenal lab power supply with huge current outputs, short circuit protection, and very tight voltage regulation.” 
Great holiday Instructable! “Use solid-state relays to blink the lights on your tree in time with music. String lots of lights onto the tree. Use as many sets as you like, but arrange them such that there are three light regions, each with a separate plug. Run these three plugs down the trunk so they can easily be attached to the light controller. Up to three strings of lights can usually be linked in series, so you can almost certainly cover even big trees. Plug light strings into the controller you built for Halloween (
Here’s an excellent “open” hardware project for controlling lighting/effects systems – you can build your own, buy an assembled kit or improve the design and modify source code – “This DMX USB interface is based on the FTDI 232BM chip, it’s a USB to serial converter. Using a simple application on a PC you can send and receive DMX512.” Thanks 
Meet the Cubatron, it’s not Castro on a light cycle, it’s the world’s largest true 3D color graphics display. Assuierupe has a very cool Flickr photo set “The coolness of this display hack is difficult to convey via static images, but check out the project page for a couple of videos of the device in action. The device was built by Mark Lottor for Burning Man, and now takes up a corner of his Menlo Park living room.” 
Nice mod if you have an old Dreamcast laying around, Raph writes – “The image on a TV is always a little too blurry for my taste, and the quality of a VGA image is very superior. I had always dreamed to be able to use my SNES on a PC monitor, but the SNES did not have a VGA output. When I learned that the Dreamcast could output a VGA signal, I installed a VGA connector on it almost instantly.” [
300 hours and approximately 130 wood joints to build, Nicholas Falzone’s excellent case mod “The Sangaku case mod a fusion of computer technology with Japanese the furniture-making tradition. Sangaku translates to “mathematics tablet” in Japanese. The top connects the sides, with the shorter pieces lining up with the lines from the doors and the acrylic strip carrying the black from the front of the case up and over through the back. The two sides started out being four sliding shoji doors, two per side, but to get the lighting to work, I combined the two on one side. The joinery on the doors was made almost entirely by hand, using Japanese chisels and a dozuki saw.” [