With SQL Server 2008 R2 RTM knocking at the door a list with R2 resources may come in handy.
So here you are:
  1. SQL Server 2008 R2 Update for Developers Training Kit (April 2010 Update)
    [quote]
    The SQL Server 2008 R2 Update for Developers Training Kit is ideal for developers who want to understand how to take advantage of the key improvements introduced in SQL Server 2008 and SQL Server 2008 R2 in their applications, as well as for developers who are new to SQL Server.
    [/quote]
    It contains presentations (22), demos (29), hands-on labs (18), videos (35) as well as an utility to help configuring your computer for running the demos.
  2. E-Learning Clinics (thanks to Greg Low)
  3. Webcasts
  4. Whitepapers
  5. GITCA Fireside Chats
  6. PASS - The Professional Association for SQL Server
  7. Articles and blogs
  8. Downloads
  9. Local Resources
  10. Other resources
  11. Free ebook: Introducing Microsoft SQL Server 2008 R2
Enjoy!