[particlebanana]

Maybe your thinking of the old FiveRuns Tune-Up app. I used that all the time when I was doing early rails projects. They got bought and shut down awhile ago but I found an old TechCrunch article on it.

http://techcrunch.com/2008/05/29/dont-debug-alone-with-fiver...

[thibaut_barrere]

I think it is (I remembered the black bar too).

It seems to be there (but not updated):

https://github.com/fiveruns/fiveruns_tuneup

[digitaltoad]

That is indeed it. I had just found it too.