Cat observation platform…
Clever cat hack from Charles Platt who is sitting in for Kevin Kelly on the Cool Tools mailing list – “…Feline Automotive Observation Platform. My cat, Eddie, used to complain constantly during car rides, but his limited vocabulary made it difficult to deduce the precise nature of his problem. When I constructed a simple detachable plywood panel faced with a thin doormat for enhanced claw traction, his complaints ceased immediately. Now he sits happily with his nose pressed to the windshield, enjoying the scenery when I got for a drive. The two supporting struts hook onto the sun-visor mounts, and can be attached or removed in ten seconds.” Link. & main site.
Dave writes – “When viewing this 
Cheyenne writes in about the homemade laser saber – “I used a reflective slider and small rare earth magnet. Very Happy I think it looks really nice with the new red 100mW. I only powered it up with the red 100mW a couple times on the video. I tried not to look at it. I really need to get some safety glasses for the red 100mW. I don’t really know how dangerous the diffused light from the saber is, but I’m not going to take any more chances then I already have.” 
How Waterloo made his own proximity cards – “Lots of companies use proximity cards to control physical access. An employee holds their card within a few inches of the reader; the reader receives a unique id from the card and transmits it to some central computer that tells it whether or not to open the door. This is rather magical, considering that the tag is credit card-thin and contains no battery. The trick is the same as for RFID tags. The reader constantly transmits a rather strong carrier; the tag derives its power and clock from this carrier, kind of like a crystal radio.” 
Didn’t make the cut with your invention? “The place to be if you are an inventor who has auditioned for any of the new Inventor related television shows such as Modern Marvels (History Channel), American Inventor (ABC) or Made in the U.S.A. (USA Network). Perhaps you never made it to an audition, let this Invention Hub shine the light on your invention web site. The network programs are interested in the top 10 Inventions, Inventor Underground is interested in the other 10,000.” 
Peter Green made a portable Mac Mini! “Why the Mac Mini Portable? Well, in short I wanted a machine that was really dinky to just pop in my rucksack, and while the PowerBooks/iBooks are pretty small, they still take up a fair amount of space. I wanted something with a very small screen that was more or less hand-held, and mac just don’t do that [yet].” [