In case you missed it, check out the December 2007 edition of TechNet Magazine which focuses on Exchange Server 2007 SP1. The Exchange-related feature articles included in this edition of TechNet Magazine are:

 

Don't forget that the December 2006 edition of TechNet Magazine also focused on Exchange Server 2007. While the articles in this edition of TechNet Magazine are based on a pre-release version of Exchange 2007, they still contain a wealth of information. I highly recommend you check them out. The Exchange-related feature articles included in this edition of TechNet Magazine are: