Our team have been working on a number of whitepapers for SQL Server 2008. On of the first of these out the door is Itzik Ben-Gan's new paper on the T-SQL enhancements. It's great reading and can be found at:
http://msdn.microsoft.com/en-gb/library/cc721270(SQL.100).aspx
I got to work with Ron Talmage on the new partitioning whitepaper. Watch for it soon too.
Congrats on the partitioning whitepaper – I'm looking forward to reading that. I've done a few partitioning deployments and it's one of those awesome features that takes a lot of work to get your head around.