Then you may want to download the Visual Studio 2005 Team System 1204 CTP Extensibility Kit. Here's the description:
OverviewThe Visual Studio 2005 Team System 1204 CTP Extensibility Kit includes a variety of documents, samples and utilities that you can use to help extend and customize Visual Studio Team System. This pre-release content is specific to the December 2004 Community Technical Preview of Visual Studio Team System.
Supported Operating Systems: Windows 2000, Windows Server 2003, Windows XPVisual Studio 2005 Team System December 2004 Community Technology Preview
In addition to what's described above, there's a document included that discusses how you can create your own customized process templates (the basis for Team Foundation projects), including modifying existing templates, exporting and importing templates, creating new work item types, and more.