1) SP1 has a CRITICAL BUG that has a MANDATORY patch for it. You MUST at least apply that.
2) SP1 has MULTIPLE (IIRC) memory leaks that will suck away your RAM over time. I STRONGLY recommend testing and patching to the latest CU!!
Best,
Kevin G. Boles
SQL Server Consultant
SQL MVP 2007-2012
TheSQLGuru on googles mail service