Since raised on W3C TAG http://lists.w3.org/Archives/Public/www-tag/2010Jan/0076.html:
I reviewed draft-abarth-mime-sniff. I'm not sure I found all of the past discussion on the document, and I probably got some wrong, but it hasn't been updated in quite a while.
I sent the review to apps-discuss (since it deals with non-HTTP sniffing as well):
http://www.ietf.org/mail-archive/web/apps-discuss/current/msg01250.html
(discussion on apps-discuss@ietf.org<mailto:apps-discuss@ietf.org>)
Since there are several W3C documents advancing that make normative reference to this, getting timely review should be a priority.
Larry
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http://larry.masinter.net