Forum Moderators: open
How about:
<search ...> similar to a form tag, but reserved exclusively for site search
<nav> delimiter for a list of links that form global, local or contextual navigation links (maybe several tags/types?)
Also <breadcrumbs>, <logo>, <pagetitle>, <pagesubtitle>, <editable> ...
And standard accesskeys for:
Go to homepage "/"
Up one level (like Google toolbar)
Contact Page, Checkout, Sitemap (also requires standard URLs?)
Skip to main content (poss. needs a tag as well?)
MonkeeSage has previously suggested a <linus> tag [webmasterworld.com]. Any content within <linus></linus> tags must be rendered how Linus Torvalds would like it/expect it to be ;)