The massive WiMax joint venture expected to be announced today is official, though the rumored details were a bit off. Sprint's WiMax division is merging with Clearwire to form a single WiMax company called...Clearwire. (But Sprint will own most of it.) Happily, the clusterfuckiness factor is lower than we figured. Google, Intel, Time Warner and Comcast are all contributing in ways that actually seem helpful and logical. Here's what they're gonna do, besides chip in $3.2 billion, all told.