After spending some time looking for Object Test Bench in VS2010 menus, I've decided to do a quick search and found this VS2010 RIP list where Habib supplies a partial list of the features removed in VS2010. I was surprised to find out they have removed Object Test Bench!
It's not as if I really needed it, there's nothing I would do with it that I can't do with Immediate window, but I did use it from time to time for some lightweight testing. I guess I won't be using it anymore, will I?
But maybe you'll be more surprised to find out they also removed intellisense for C++/CLI!!!