Over 2200 of you responded to our SurveyMonkey on how you are actually using various new web standards (sometimes all classed under the generic heading 'HTML5').
Before anything else: thanks for your responses! We'll certainly take them into account as we prepare and curate content in the future.
Results are below, but I think a few things deserve some comment.
First, and probably no surprise, CSS3 is the big winner. In a sense, CSS3 is different from the other standards we asked you about, because CSS can be used on all sites, while the rest are pretty much used for specific purposes. And many CSS3 modules don't differ radically from their predecessors, so they don't require a totally different approach to web development -- they just improve existing standards significantly.
Second, the two next-highest scorers were drag-and-drop and the new semantic elements -- an interesting pair, since drag-and-drop is part of the UI, while the semantic elements organize the data itself. Again, it looks like HTML5's brand-new features are (so far) less popular than HTML5's ability to do old things a lot better.
Finally, the results of our questions on Flash/Silverlight conversion and HTML5 vs. native mobile apps suggest that you aren't jumping on the HTML5 bandwagon willy-nilly, but you do have some serious hope for HTML5's future (cf. the native vs. HTML5 mobile apps results).
Thanks again for participating, and we hope you find the results interesting!