There have been a few questions about how to correctly uninstall all of VS 2008 Beta 2 in order to install the final version of VS 2008. Scott Guthrie posted the steps for doing this earlier today. A subset of this list would apply if you have installed Team Foundation Team Explorer 2008 Beta 2, rather than the full VS 2008 with Team Explorer.
At the end he recommends rebooting after removing everything and before installing VS 2008. From my experience, that’s good advice. The only thing additionally I’ve typically done after uninstalling a non-RTM build is to delete the VS 9.0 registry hives (HKLM and HKCU) and the VS 9.0 directory under “Program Files.” Of course, there are no guarantees with this, editing the registry may render your machine nonfunctional, etc., so be careful and back up your data.
Visual Studio, How To, Guide, Microsoft