If you ever need to compare versions of Sharepoint (Foundation, Standard, Enterprise) check out the following site:

http://sharepoint.microsoft.com/en-us/buy/Pages/Editions-Comparison.aspx

This page offers a break down of all SharePoint features, by version. Each feature is demonstrated by a video overview of the functionality.
A great resource for anyone, sales/business analyst/dev, who needs to describe SharePoint features to end users.