I think that Typepad may have just switched it’s Atom feeds from .3 to 1.0. How do I know? Because two blogs I read just popped up with 10 new entries (none were new) and each one was broken in Bloglines. (Which is the single largest aggregator in the world, at least according to WordPress.com feed stats.) Here is Seth Godin’s as viewed by the feed validator. This is a bold move, but I certainly wouldn’t want to be their support department tomorrow. This could also just be my misunderstanding, as some feeds like this one from Marginal Revolutions (one of my favorite blogs) seems to be on Atom 0.2.