So far I've found SQL Server 2008 SP1 to be rock solid. I run the X64 version on a Windows Server 2008 x64.

I'm now contemplating R2 i.e. not worried about SP2.

My company is likely to adopt Power Pivot so we need R2 and Office 2010.

It is nice to be bleeding edge for a change but with 2008 I have nothing bad to say about it, only praise.

David