Though the box bills it as compatible with every iPhone and iPod released since 2005, Apple's new iPad 10W USB Power Adapter ($29) was clearly designed primarily for the iPad: it adds a six-foot long rubber power cable to the same 2.1-Amp USB adapter and USB to Dock Connector cable packed-in with iPads, extending their prior roughly three-foot length to nine feet. You can use the 10W USB Power Adapter with its detachable, compact wall blades if you…