Brian's recently announced the availability of the the Team System Web Access Power Tool.  We've been using it internally for the past 3-4 months and as with most dogfooding efforts, we've found and fixed a bunch of issues.  I think you'll find this release to be easier to use and have better performance than previous releases of what was formerly known of as Teamplain 1.0 from DevBiz.  While it's still not an official part of the Team Foundation product, it's certainly close enough for most people to adopt and use it on a regular basis.  Be sure to check it out!