Using Data Protection Manager v2 to Protect Exchange Level 300 Webcast
DPM is a fantastic product - I've personally seen many customers taking advantage of it's robust feature set to save $$. The question I've been asked most since we announced DPM v1 was, "How can I back up my Exchange server with DPM?".
With some of the new clustering features in Exchange 2007 you are off to a rolling start but DPM provides some additional redundancy that you might be interested in. Here's a link to a 300 level technical webcast on how it works:
http://msevents.microsoft.com/CUI/WebCastEventDetails.aspx?EventID=1032322917&EventCategory=4&culture=en-US&CountryCode=US