I've recently been attending an XHTML 2 and XForms tutorial by Chair of
HTML and Forms working groups Steven Pemberton. Here are my impressions:
XHTML 2 and XForms
http://blog.outer-court.com/archive/2005-04-20-n24.html
XHTML 2 Headings
http://blog.outer-court.com/archive/2005-04-20-n74.html