http://www.w3.org/TR/NOTE-authentform
With only some complex Javascript hacks making it a possible solution:
http://www.peej.co.uk/articles/http-auth-with-html-forms.htm...
Also, HTTP authentication is a benefit to RESTful service design. Cookies have always been the wrong solution to this problem, having all web services to move to HTTPS feels like missing the point.
http://www.w3.org/html/wg/tracker/issues/13?changelog
http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2008-Nov...
Digest is vulnerable to MITM attacks. It's only secure against passive sniffing, but if you can sniff, you usually can also modify response, spoof DNS/ARP/base station. If everyone switched to Digest, it would be only a matter of time when someone writes Digest-stripping Firesheep2.