Implement history.state http://www.whatwg.org/specs/web-apps/current-work/#dom-history-state It looks like Firefox 4 and Opera 11.50 implement history.state. It is pretty useful to allow pages to read the current history state directly without just having to wait for a popstate event.
<rdar://problem/10348256>
@jochen: There's been some work on this topic in Bug 76035. *** This bug has been marked as a duplicate of bug 76035 ***