Starting last month, MSDN put together a regular series of webcasts on WCF and WF (focusing on .Net 3.5).  Here are the talks being broadcast in July:

July 7th, 10:00AM (PST)
Transactional Windows Communication Foundation Services with Juval Lowy

July 9th, 10:00AM (PST)
Using Windows Workflow Foundation to Build Services with Jon Flanders

July 11th, 10:00AM (PST)
WCF Extensibility Deep Dive with Jesus Rodriguez

July 18th, 10:00AM (PST)
SharePoint Server and WCF with Joe Klug