A common question I have been hearing from some of you, hopefully these documents will help answer the question: http://www.microsoft.com/sqlserver/en/us/product-info/compare.aspx
For instance for Analysis Services between the Enterprise and Standard edition, here is what you get:
Also read this whitepaper for further information: SQL Server 2008 R2 and SharePoint 2010 Products: Better Together (white paper) (SharePoint Server 2010) - http://technet.microsoft.com/en-us/library/cc990273.aspx