Agreed that this is all cool stuff. But as developer of a webapp that heavily leverages webcam / mic access (blatant plug: http://activeinterview.com), I'm waiting anxiously for this to get fleshed out:
I imagine the best way is to get the source of Firefox or Chromium and have a go at implementing it yourself. Things move quicker when there's code for people to look at and improve.
http://dev.w3.org/html5/html-device/
Device access! Then we can really drop kick Flash when needing to talk to devices like webcam/microphone.
But alas, it could be a while? http://stackoverflow.com/questions/3012002/what-web-browser-...
As someone far removed from the standards bodies, how can we support this effort and push things along?