H254 is indeed catching on. Abobe will fight tooth and nail to keep Flash the standard and Mozilla and some of the open source folks want Ogg/Theora for HTML5. Tally up what most of the pr0n sites are using and it's a safe bet that it's got 90%+ market penetration - slightly less in religious institutions, slightly more in Congress. 

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken