Doubtlessly you’ve seen all those cool pix from the Maker Faire showing the amazing LED displays on bike wheels. The only thing cooler than having such a gadget is building it first! Hacker and electrical engineer Limor Fried (a.k.a. Ladyada) has easy-to-solder kits available from her online store. Or, if you’re more daring (or just component rich) she has free schematics, software and firmware available for download. Just the thing to get the kids to pick up the soldering iron!