I asked Jeremy Kelley if such animals existed and sure enough, they do. A great way to keep the pulse of everything coming from those bloggers.
http://blogs.msdn.com/MainFeed.aspx?Type=AllBlogs
http://blogs.technet.com/MainFeed.aspx?Type=AllBlogs
(I think you can leave off the ‘?Type=AllBlogs’ query string and get the same result – but haven’t verified.)