Speaking at GoldCoast Users Group today on new SQL 2008 R2 features.
StreamInsight, Gemini, SQL Server Utility Control Point, Data Tier Application (DAC), and Report Builder 3.0 with map support are the coolest new features.
Helpful resources I’ve found so far:
SQL 2008 R2 Books Online
http://msdn.microsoft.com/en-us/library/bb418432%28SQL.10%29.aspx
Johan Åhlén StreamInsight Blog
http://blogical.se/blogs/jahlen/
Robert Bruckner’s Advanced Reporting Services Blog
http://blogs.msdn.com/robertbruckner/
Ping me if you want slides or resources.