There is a new option for taking TFS for a test drive:

 

Free 6-week hosted trials of TFS are being offered by TeamDevCentral.  It includes:

·         Accounts allowing customers to experience different team roles and to collaborate within a project

·         Up to 4 hours of guidance and/or support for the trial can be used for any type of advice related to TFS or Visual Studio Team System

 

You can sign up for the trial at their website, or read the press release:  Press Release: TeamDevCentral Offers Free Trials of Hosted Microsoft Team Foundation Server