It would be wonderful to have the task bar on both monitors when using dual display. I know there are some softwares that can do this but it's kind of buggy and wont work with Taskbar Shuffle
I have used it before, it works great. However, and I didn't use it very long because the second monitor had to leave my desk, I couldn't get it to work with an aero taskbar. I have seen screenshots of it that way though, So I am sure it is possible.