I just added links to a few interesting blogs written by MSN employees that specifically work for the Spaces group.  I don't work directly with or even know many of these people, but while some of the blogs are purely personal several of them have some really good tidbits and insights to MSN Spaces.  Here's a quick list:

• Tom Harpel: A PM with MSN that was part of my interview loop a few years ago (thanks for the 'hire' vote!).  Somehow, someway I came across his blog site (probably via the 'Updated Spaces' list) which in turn led me to the other MSN Spaces peeps listed.  Check out his MSN Colleagues list.
• Mike Torres: A Lead PM with MSN Spaces.  He talks about updates and insights into what's going on in the world of Spaces.  Good stuff.
• Michael Connolly: The Group PM for MSN Spaces.  He's Mike's boss (at least that's what Mike says in his blog) and also provides several insights into MSN Spaces.
• Scott Isaacs: An architect with MSN Spaces. 
• Ryan Parsell: A software design engineer with MSN Spaces.
• Dare Obasanjo: Yet another Spaces guru!
• Jason Antonelli: Dev manager for MSN Spaces. Yet another good source for info on Spaces.
• Paul Elliotti: A PM with the MSN Web Platform group (according to MC's blog).  Some interesting and funny stuff about MSN in general.