So with the release of MOSS 07 to technet and MSDN, there is some cool collateral for developers and IT Pros. One of the simple articles I like is the new features in MOSS 07, here:

http://technet2.microsoft.com/Office/en-us/library/527763c3-90a5-4d3b-9781-fc9580314a2d1033.mspx

From surfing around I found this site from the US subsidiary who have done a cool video about the differences and features in MOSS 07: http://office.microsoft.com/en-us/sharepointserver/HA101672721033.aspx

And even better here they have some really specific task based demo stuff: http://office.microsoft.com/en-us/sharepointserver/CH102066971033.aspx

Enjoy!