Some people are starting to build tools to integrate VSTS into Eclipse ...
To quote:
"The primary client for Team Foundation is Visual Studio itself, but that obviously runs only on Windows. If you have even one person who needs to access source control or work item tracking from a non-Windows platform, this is a big problem. In large enterprise environments, this is not only a big problem, it is a common one.
To address this need, we are building tools which allow users on Linux/Solaris/MacOS to access the source control and work item tracking features of Team Foundation. The Allerton product will include a rich GUI client, a command-line client, and support for integration with Eclipse."