This is often a common push back or at least concern with big shops whom are considering adopting Team Foundation. How do we integrate our Java Developers (or non .NET Developers) into the Zen of Team System?
Enter TeamPrise. This looks like a serious gap filler. On their site you can download a trial that works with the July CTP of the Team Foundation Server. Lastly, TeamPrise is a division of SourceGear.
UPDATE: Also check out devBiz X5 web client - work item tracking via the browser - everybody has been asking for this one, say for example to integrate customer change requests into the team work flow. It doesn't yet seem to allow you to only edit certain types of work item types (they really need that) or to have an external authentication scheme. [Eric Jarvi]