SQL Server 2008 Upgrade Technical Reference Guide
I think I missed writing about this, my friend and cose buddy Arvind was involved in this and he had passed me the link. Today I just took a tour of the same and was amazed by the detailing this close to 500 pg document outlines from Relational to AS to IS to RS and a whole bunch of checklists to use. This is like a bible guide I would want to recommend to everyone involved in migrating from SQL Server 200/2005 to SQL Server 2008.