We had all of that in Web 1.0, why stick that 2.0 label on it? As far as ad management software goes there's a huge selection out there already so it would be difficult to compete.

Now, if you're going to make a "2.0" piece of software add some "2.0" features in there. First on my list would be serving new ads on "page load" (ie, when the page doesnt load, in an ajax app). Quite where you might involve a community aspect in there is beyond me at the moment.