Myself, Ewan Dalton, Allister Frost, Eileen Brown, Brett Johnson and a few other folks are on the road with the Exchange 5.5 Unplugged tour right now! 

Our mission - help customers migrate from Exchange 5.5 to 2003! 

We've started a parallel blog tracking our antics at : http://blogs.technet.com/technet_uk_-_exchange_tour/default.aspx

You can also find out about the tour at : http://www.microsoft.com/uk/technet/unplugged/default.mspx

For customers who are interested in how to make the move then feel free to sign up and come along!