It was almost a year ago that we first heard about FreedomPop, a startup built on the manifesto that every American (yes, you) should have access to free wireless broadband. Ten months later, the pay-as-you-go service is launching in beta, with "free" meaning 500MB of data per month. For the time being, the touted 4G service will come courtesy of Clearwire's WiMAX network, but FreedomPop says it will switch to Sprint's LTE spectrum sometim