Very cool, thanks for the links! I happened across this just today while watching a video and wondered how they did those speech bubbles. The quality was obviously better than text in the video.
Yeah, I stumbled upon an interactive Youtube video and wondered how they did it. Combined with the higher quality Youtube deliver, this could be really cool.
I use VMware virtual machine with a Linux player running inside of WinXP Pro to get on the web. YouTube has always played as well with Firefox in VMware/Linux as when using Firefox in Windows. However, these new features did not appear in the Linux version of Firefox (all worked fine in the Win version of Firefox); bummer