It’s pretty often on any version of SharePoint that someone asks the difference between the versions of SharePoint (ex: free vs. server vs. standard vs. enterprise). On Microsoft’s website for SharePoint, there is a page that displays all the features for SharePoint 2010 as they relate to each version (Foundation, Standard, Enterprise).
http://sharepoint.microsoft.com/en-us/buy/Pages/Editions-Comparison.aspx
It’s interactive, so you can highlight each feature for further information or filter according to the realm of SharePoint that it’s in.
I would just loooove it if this were available in a printable format ... The floaty bubbles are cute and all, but I'm trying to sell the business owners, stakeholders, and sponsors on these features, and floating times 100+ bubbles is a bit much.