My ex-teammate Jeromy Carriere has started a blog. Or should I say he started a blog months ago but only recently started writing anything but test posts. He was part of a panel @ OOPSLA (which was happening concurrently with PDC) on app servers, which he describes in detail.
So that makes one current teammate and two ex-teammates who are blogging. (The other ex-teammate is Rick Culpepper, who left MSFT in search of less traveled pastures.) I think that number needs to go up.