ReSharper + Orcas = Bad
A small warning: Do not install the pre-release of ReSharper 3.0 on Visual Studio Orcas. Although the installation works, ReSharper does not handle the C# 3.0 syntax correctly (it really doesn't like x => x+1 syntax), and the intellisense gets all screwed up. Trying to uninstall ReSharper 3.0 resulted in my VS Orcas having an empty "ReSharper" menu, and with the intellisense gone, which I had to fix manually (by scanning the options menu for about an hour for the right option). To add to the fun, my installed ReSharper 2.5, which is installed on VS2005, has lost its highlighting features in the process, so I had to reinstall the 2.5 version. Fun.