So, there are a couple of Exchange 2007 videos available on the web, that I would like to mention:

• Evan’s TechEd session video is posted - This session covers the new Windows PowerShell-based Exchange cmdline and scripting interface. Learn how to convert your multiple page Visual Basic and COM scripts to mere one-liners in Exchange 2007. We cover the basics of the management shell, as well as the underlying design and key concepts. Additionally, we go into more depth on how to build larger scripts that can be used to automate small, medium, as well as enterprise business scenarios.
• TechED 2007 talk; Kristian Andaker on Exchange 2007 SP1 OWA improvements - At TechEd 2007 in Orlando, Florida, I was able to get some more time with Kristian Andaker, Group Program Manager, to record a quick interview around new or updated capabilities for Outlook Web Access (OWA) in Exchange Server 2007 SP1. 
• TechED 2007 talk; Becky Benfield on Exchange 2007 SP1 Standby Continuous Replication (SCR) - At Tech Ed 2007 in Orlando, Florida, I was able to get some more time with Becky Benfield, Principal Program Manager, to record a quick interview around one of the new high availability capabilities that will be available in Exchange Server 2007 SP1.  Here is a very informative interview on the new Standby Continuous Replication (SCR) feature due out with Exchange Server 2007 SP1.

Enjoy!