Preview 5 of Teamprise is now available for registered users to download (registration is free). This release is compatible with Beta 3 and Beta 3 refresh of Visual Studio 2005 Team Foundation Server. We'll be releasing another preview release after Release Candidate comes out (due any time soon).
I use the Preview 5 release day-to-day for the continued development of Teamprise in Eclipse. Considering I spend most of my time on the end of a VPN connection the source control works incredibly well. We also use the command line client in the build scripts to download the source onto the build server (which is on a meaty linux box).
Anyway, if you are currently using VSTS and you have some Java folks in your organisation then I suggest that you point them at the Preview 5 download page so that they can join in the party. Even if you don't use Eclipse for your day-to-day development, I'd also recommend you try the Teamprise Explorer (a stand-alone client) if you are just using VSTS for source control. IMHO, it's a more compact interface than Microsoft's Team Foundation Client (which currently just looks like Visual Studio). Also, the compare dialog is really nice. You wouldn't believe it was a 100% java client, SWT is soo much of an improvement from the old Swing days...
