Take a look at http://www.coordinatr.com - they have something similar.
Is there anything you'd like to see in such services? such as "um... ok now. I need to do this next, and it is not here" or "after organzing something, this is what I move forward with it." etc
I tried to add something easy, but everytime I try to attack one particular problem, it makes the whole thing complex, which is not what I intend to do.