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That made me curious so I removed Flash from /Library/Internet\ Plug-Ins/ and rebooted. I'm unable to play video on either Vimeo or YouTube so I'll be sticking with Click to Flash for the moment.

Youtube: http://www.youtube.com/html5

Vimeo: Right below the description, see: http://imgur.com/yuf4R

Obviously not an automatic fallback but I guess that's because it is still in 'beta'.

Youtube videos with ads won't work, or embedded ones (I think the same goes for embedded vimeo vids)

Thanks for the links — I'd just expected the sites to fallback. For anyone else who's tempted to try this out, unless I missed it there is also no 'Switch to HTML5 player' link for channels on Vimeo.

I had to put the plugin back: http://twitter.com/gideonklok/status/15475873118

Btw. I did already opted into the html5 beta tests here and there. That might have influenced the result.

I'm using http://clicktoflash.com/

You could give http://clicktoflash.com/ a try