Sold in separate versions for the iPod nano ($15), iPod classic ($20), iPod touch ($20) and iPhone ($22), JAVOedge's JavoSkins are commodity-class generic rubber cases with front screen and control holes, top or bottom headphone and Dock Connector holes, and rear slits for armband mounting. They all include fabric necklaces -- gray for the iPods, white for the iPhone -- and the iPhone version also includes a ratcheting belt clip and nub. None includes…