Users  of the LINQ May CTP will know that while LINQ is positively awesome, it knocks Visual Studio's coding tools for a loop.  I have become particularly dependent on right-clicking on an interface and having Visual Studio provide a stub implementation for me ... kind of a must-have with some of the lower-down channel layer interfaces in the Windows Communication Foundation. 

Happily, there is a fix that I found in the LINQ forum.  In case you aren't familiar with it, here it is:

1. Start RegEdit.exe
2. Open HKEY_LOCAL_MACHINE\Software\Microsoft\VisualStudio\8.0\Packages\A066E284-DCAB-11D2-B551-00C04F68D4DB\SatelliteDLL
3. Edit the "Path" value and change it from "c:\program files\Microsoft\Visual Studio 8\VC#\VCSPackages\1033\" to "C:\Program Files\Microsoft Visual Studio 8\VC#\VCSPackages\"
4. Goto C:\Program Files\Microsoft Visual Studio 8\Common7\IDE and run devenv /setup, and then devenv /resetuserdata and then devenv /resetsettings CSharp