The Vanishing Image: XHTML 2 Migration Issues — I think it's to early to talk about issues. object is cool and should be used; we all know that. So let's ban <img /> and introduce <object>. You could call this an action against Internet Explorer and you are damn right it is!
XHTML2 Explorations, Part I — more interesting, but I almost knew everything (yeah I read the specification, I should do it again sometime, cause it has changed a bit)