Usually I compile these lists myself however it looks like Eileen beat me to it.  Check out next months Exchange webcasts:

TechNet Webcast: Giving the Administrator More Control with Exchange Server 2007 (Level 200)
Monday, July 02, 2007 - 9:30 AM - 11:00 AM Pacific Time
Chris Avis, IT Pro Evangelist, Microsoft Corporation
http://msevents.microsoft.com/CUI/EventDetail.aspx?EventID=1032343422&Culture=en-US

TechNet Webcast: Overview of Exchange Server 2007 Service Pack 1 (Level 300)
Thursday, July 05, 2007 - 11:30 AM - 12:30 PM Pacific Time
Ed Banti, Technical Product Manager, Microsoft Corporation
http://msevents.microsoft.com/CUI/EventDetail.aspx?EventID=1032341340&Culture=en-US

TechNet Webcast: Introduction to Windows PowerShell Scripting in Exchange Server 2007 (Level 200)
Wednesday, July 11, 2007 - 8:00 AM - 9:30 AM Pacific Time
Matt Hester, IT Pro Evangelist, Microsoft Corporation
http://msevents.microsoft.com/CUI/EventDetail.aspx?EventID=1032343632&Culture=en-US

TechNet Webcast: Deploying and Migrating to Exchange Server 2007 (Level 200)
Wednesday, July 18, 2007 - 8:00 AM - 9:30 AM Pacific Time
Keith Combs, IT Pro Evangelist, Microsoft Corporation
http://msevents.microsoft.com/CUI/EventDetail.aspx?EventID=1032343650&Culture=en-US

TechNet Webcast: Technical Overview of Forefront Security for Exchange Server (Level 200)
Wednesday, July 25, 2007 - 1:00 PM - 2:30 PM Pacific Time
Bryan Von Axelson, IT Pro Evangelist, Microsoft Corporation
http://msevents.microsoft.com/CUI/EventDetail.aspx?EventID=1032343668&Culture=en-US

TechNet Webcast: Recipient Management, Policies, and Permissions in Exchange Server 2007 (Level 200)
Friday, July 27, 2007 - 11:30 AM - 1:00 PM Pacific Time
Kevin Remde, IT Pro Evangelist, Microsoft Corporation
http://msevents.microsoft.com/CUI/EventDetail.aspx?EventID=1032343672&Culture=en-US