Where are the best on-line resources for getting up to speed and keeping up with HTML5 and CSS3?
Blogs to follow, lists to join, forums to bookmark. If I want to be at the bleeding edge of page markup what sites should I be visiting daily?
You should check out http://html5doctor.com/.
It's being run by a group of very respected designers, developers and usability/accessibility experts. They're all actively involved in the development of the HTML5 spec.
As well as providing tips on how to use the new features, they are keeping tabs on any changes to the spec as it develops.
For CSS3, http://www.css3.info/ looks like a pretty good resource. I haven't had an in depth look at it yet, but my first impressions are very positive.
Other than joining the what-wg list I would recommend:
I visit all of the sites outlined above. I subscribe to the feed at hacks.mozilla.org. I pick and choose the bits I want to try and then I play with it.
So for instance I was involved in a project that needed to put some video on the page. This gave me a chance to play with HTML5 video (with Flash and Quicktime as fallback options) and so I went ahead and did it.
As regards CSS3, I sprinkle bits of it here and there throughout my templates. I like to use "progressive enrichment" , so things like rounded corners and drop-shadows are done using CSS for browsers that support them (unless they're a fundamental part of the design, in which case I'll find another way). IE users just don't see those "features". No biggie.
If you want to be on the absolute bleeding edge, some useful bits come out of planet.mozilla.org and planet.webkit.org which aggregate loads of bloggers working on those projects. There's a lot of noise there too, though.
Give Nettuts a try, they have new stuff added every day and are really on top of new trends, technologies, etc.