some useful links for dealing with blg file and performance analyses

How To: Use CLR Profiler 

http://msdn.microsoft.com/en-us/library/ms979205

patterns & practices: Performance Testing Guidance

http://perftesting.codeplex.com/wikipage?title=How%20To:%20Identify%20a%20Disk%20Performance%20Bottleneck%20Using%20SPA&referringTitle=How%20Tos&ProjectName=perftesting

Log Parser 2.2

http://www.microsoft.com/downloads/en/confirmation.aspx?familyId=890cd06b-abf8-4c25-91b2-f8d975cf8c07&displayLang=en