Visual Studio.Net Powertoys are really expanding.  The groups on gotdotnet have really done a great job.  I am hooked on the SystemWindow and the Online Search.  After seeing the demos of what is supported in VS.Net Whidbey, there are some really cool features coming down the line.  Some of these features, like refactoring, will probably make it into SharpDevelop before Whidbey releases.  Borland recently announced a C#Builder IDE and a personal version is available for free for non-commercial use (?), but I think SharpDevelop is better.  Of course Eclipse has a C# plug-in but it is not very good.  I like EMac’s plug-in better.  In my opinion, all of these IDEs are a bit behind the times compared to IntelliJ IDEA.  To my delight, Jet Brains has announced that they will create a C# IDE.  It is a great time to be a .Net developer!