The Windows Live product teams have a number of blogs, some hosted on MSDN and others on MSN Spaces.
Now you can keep up with all these in any one of four ways.
or, 3. Whack this OPML file into your feedreader.
or 4. Check out Liveside.net (it seems to have most of the Live team / individual blogs covered).
By the way, dev.live.com is the new developer center for Live stuff went, er, live last week. It is called Windows Live Dev. As a beta, of course.