If you want to compare what feature comes with the different editions of SharePoint 2010 you can go to this site: 
You will find a nice table that compares SharePoint Foundation VS SharePoint Server Standard and Enterprise. 
 
Be aware that under the Enterprise edition it says that you have access to these features:
Advanced Content Processing
Advanced Sorting
Business Intelligence Indexing Connector
Contextual Search
Deep Refinement
Extensible Search Platform
Extreme Scale Search
Rich Web Indexing
Similar Results
Thumbnails and Previews
Tunable Relevance with Multiple Rank Profiles
Visual Best Bets

They are in fact available with the Enterprise version of SharePoint Server 2010, but you need to have a Fast Server in order to use them.

Serge

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