Hi David,

We've been hosting TFS for clients large and small for almost 2 years, (first in North America).  It's called "TeamDevCentral", (TDC).

We are a certified MS partner and providing free trials in partnership with MS.  Use Option 2 for a hosted trial:

http://www.microsoft.com/visualstudio/en-us/try/default.mspx

If you're interested in an established, reliable and secure hosted TFS solution, you can also visit us at directly at:

http://www.teamdevcentral.com