The Google IO conference keynote for day 1 covers a lot of interesting HTML5 topics.
The whole thing is a series of 10 minute YouTube videos, starting at #2 (the first is just a very long intro with random animations).
http://www.youtube.com/watch?v=02WB4dRG ... B7&index=1
That should auto-switch to the next videos in the series, but if not they're in the related videos section.
(Once you get to the stuff on Google App Engine and Google Web Toolkit, that part is all a bit meh - skip to 02:30 of #9 for some Android sneak-peek stuff.)
I've already been looking forward to useful HTML5 support for various reasons - not paying a great deal of attention to canvas/etc - but there's some really cool stuff there, that I've already got hundreds more ideas than I have time to implement!
Looks like it's going to be a cool time to be a web developer!