The Jazz team announced that RTC will support VS2010 in RTC version 2.0.0.2 iFix3, which is currently at milestone 1 build. This includes full client support on Windows 7. This build is primarily for developers that work with VS - if you don't work with VS, then you can/should ignore the build. The interim fixes appear to be coming out every 45 days or so, so expect a full release of this iFix by the end of May.
RTC already supports the previous version of Visual Studio (2005 and 2008). If you are not familiar with the interaction of Team Concert and Visual Studio, here are some videos on getting started with the product.
Getting Started with Rational Team Concert and Microsoft Visual Studio - Part 1
Getting Started with Rational Team Concert and Microsoft Visual Studio - Part 2
Getting Started with Rational Team Concert and Microsoft Visual Studio - Part 3