You could look at something like Project Wonderful, but I think they're a little more geared towards small-scale niche advertising (gaming, comics, blogs).

Actually, never mind. I just looked and their top 5 sites are all well under 1,000,000 page views - and 4 of the 5 are webcomics plus Omegle which I think is one of those random chat sites that popped up a few years ago.