Microsoft has purchased Teamprise, who created a Team Foundation Server plug-in for Eclipse as well as extensions for doing Java builds with Team Foundation Server.
http://www.microsoft.com/presspass/press/2009/nov09/11-09TeamprisePR.mspx
This is big news since many of the industry experts from the analyst firms have cited lack of multi-platform support for Team Foundation Server Client as a weakness of the platform. Eclipse is now a fully supported MS environment for ALM.