The Architecture Series - An interesting set of talks posted to MSDN on architecture in the Longhorn wave.  Would highly recommend Pat Helland's talk.  If you've never seen him speak, it is worth your time.  He does a great job of talking about how to implement SOA today (reliable messaging, stateful behavior, etc.) and what's coming down the pike.  And, he's the only presenter I know who can get through 90 slides in 90 minutes, well, other than Damien Conway, I suppose.  (Anyone ever seen Damien?  Amazing Perl guru.)