Brian Harry recently posted about the Sept 2007 version of the TFS Power Tools. Apparently this will be the final release of the Power Tools for TFS 2005 client. The package includes a command line interface for TFS, Process Template Editor, Check-In Policy Pack, etc.
The command line interface looks particularly useful and allows you to rollback committed changes, undo a changeset, query work items, and many other tasks.
Click here to learn more about TFS Power Tools and download the Sept 2007 release.