This is a blog from an x264 developer, who has vested interests in promoting H.264.
He is also a jerk who moderates his blog to weed out comments criticizing his methodology or motives.
The reality is, that WebM is great for the web. (But not great for the pockets of MPEG-LA and a few x264 developers).
Google rocks for releasing this to the world!
He's an engineer that breathes Assembly and C code. Spare me his motives seeing as he's put a ton of work into the FOSS x264 camp.