And here it is:

The logo is a general-purpose visual identity for a broad set of open web technologies, including HTML5, CSS, SVG, WOFF, and others. In addition to the HTML5 logo there are icons for eight high level technology classes enabled by the HTML5 family of technologies. The icons can be used to highlight more specific abilities, such as offline, graphics, or connectivity.

I don’t think there’s much more to say really! We might look for a way to incorporate the logo into the site – it was nice of W3C to design it in out colour scheme…