Sean Wallbridge
The following URL is a great reference for comparing the various SharePoint editions, between Foundation, Standard and Enterprise editions of SharePoint 2010. As well, you can break them down into the various slices” of the SharePoint Wheel – Sites, Communities, Content, Search, Insights and Composites.
Check it out: http://sharepoint.microsoft.com/en-us/buy/Pages/Editions-Comparison.aspx