Visual Studio Team System 2010 comes along Client and Server components:

Server Component:
Team Foundation Server 2010 is the Server component which manages the source control, assets, communication between VSTS client tools and integration of VSTS with other Microsoft family products like Project, Exchange, BizTalk, SharePoint etc.
Client Component:
Architecture Edition:
Helps Architects to visually model the applications, automatically generates code, logically verifies deployments etc.
Development Edition:
In the 2010 release Microsoft has merged the Database and Development editions. The combined editions now facilitate you with profiling tools, database design and development tools and .NET code analysis.
Test Edition:
Tool for testers for load testing, quality testing, test modeling, multi-user testing and stress testing etc. The tool generates logs, images and videos of the test executions and steps performed.
Team Suite:
Includes the features present in all of these client tools.
For more reading:
http://www.microsoft.com/presspass/itanalyst/docs/03-01-09VSTS2010TA001626ADT.PDF

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