I've been working on a team with Roger Doherty building parts of what's now become the SQL Server 2012 Early Adoption Cook Book.
So, if you work on the bleeding edge of SQL Server and are keen to get your head around what's coming, this is a seriously good resource.
Time to go and get it.
The material is constructed as a large number of bite-sized pieces. Each presentation is about 15 minutes in length, and each demo is about 5 minutes. And there are lots of them.
Look for recordings of these by the original authors on the Channel9 website soon too, followed by local in person presentations from Joe Homnick in many locations.