Dan Fernandez posted about the Object Test Bench in Visual Studio 2005 as well as the new Class Designer. I've played around with both featurs but didn't notice the “View Object References” option. This adds Framework classes used in your OM, and from there you can easily test out .NET Framework class functionality without creating a Console app (or using use Snippet Compiler).
BTW - I find this interesting enough to post about because if I create a new Console app nowadays, Visual Studio will default the name to ConsoleApplication147 if that tells you anything. :-)