Navigation, sections, headers, footers and figures, audio and video tags, asides, dialogs, time, meter, progress, and some scary looking tags aimed at the "interactive" web including datagrids and menus.

New elements in HTML 5 [IBM developerWorks]

Watch as the browser companies implement them all ever so slightly differently and watch as no-one uses them. Like ABBR and ACRONYM.

I will admit I find the idea of a standard NAV tag and blog post related tags like SECTION, ARTICLE and HEADER interesting although they seem a little like HTML trying to catch up with RSS/Atom which is... weird.

Now if only they had an "advertisement" tag we could all ignore.