You can download a free developer kit for SQL Server 2008 R2 (there's also one available for SQL 2008, the link is at the bottom of the R2 download page). Each kit has videos, samples, labs, and more to help you learn about new features. For instance, I can open the FILESTREAM.HTM page and have access to a presentation and two demos. So download it today and start learning about new features!

http://blogs.msdn.com/rdoherty/archive/2010/02/03/announcing-the-sql-server-2008-r2-update-for-developers-training-kit.aspx