I had Visual Assist working on Visual Studio 2003 but after uninstalling VS 2003 and installing Visual Studio 2005 it is not working with VS 2005 even after installing again the Visual Assist.
jpizzi is referring to your license key. you may need to renew your VA license to run the latest version, but you can still run 1440 in demo mode to try out the new features, including VS2005 integration.