Clearwire says it has covered 20 sq mi of Silicon Valley with its service for testing: This isn't a commercially deployed network; rather, it's intended to cover major Clearwire partners' California campuses, including Intel (which has long had early test and now commercial WiMax up around Portland), Cisco, and Google. Cities covered include Santa Clara, Mountain View, and parts of Palo Alto. The full Bay Area commercial deployment is slated for next year. (Intel and Google are investors.)
The network will allow developers to test applications and service in real coverage circumstances, while Clearwire can experiment with hardware and software tweaks without disrupting users.