google blog Atom feed — 72 errors
it's also using atom .03, which is an obviously deprecieated format.
www.google.com — 47 errors
google news Atom feed — 116 errors — it's also Atom .03
the google news RSS feed does validate, but with some serious cavets in fact, i'm not sure it really *does* validate, more likely the feed validator is choking for some reason or there is some badly nested XML.
Having some invalid HTML on their homepage is one thing, but having invalid XML served as feeds is entirely inexcusable.