is there an Execution Endpoint 2010, or does it go to Execution Endpoint 2005?

Yes reportserver 2005 and 2006 are deprecated from sql2008r2 itself. So, you need to use the 2010 execution endpoint which is available.

for more information :

http://msdn.microsoft.com/en-us/library/ms155398.aspx

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Rakesh Jayaram http://blogs.msdn.com/b/rakesh_ramblings/