Int has always been my hierarchy ID, but hey, new is good. I guess it remains to be seen how this will perform in the real world. It seems like there are a lot of new features in SQL 08, from this new data type (and why the hell would they put ID at the end of a data type? they don’t even do that for UniqueIdentifier, which really is an ID wrapped up in a data type!) there’s geo data and more.
We’ll probably wind up upgrading right around the time SQL Server 2011 is released, but I’m still interested in this new version and the direction SQL and Microsoft are going in general.