One of the most popular "extras" for Team Foundation Server is the Team System Web Access (TSWA) power tool. This is a power tool that provides a fantastic web interface into TFS and as a power tool, it is completely free to licensed TFS users.

Hakan and the team at Microsoft have been busy enhancing TSWA 2008 and they have released a CTP of the upcoming Service Pack 1 for TSWA 2008. Hakan has all the details of What's new in TSWA 2008 SP1 in his blog post which is well worth a read.

You can download Team System Web Access SP1 CTP here and TSWA 2008 here if you don't already have it.