Actually, not my site, but a friend raised the question when I was talking to him this week.

He administers a website that (currently) derives most of its revenue from advertising, and he's worried that his ad rates are quite small.

He pointed out that there don't appear to be any metrics out there for comparing website page impressions or unique visitors -- to find out if his is a particularly large website, and if he could be getting a better ad rate.

So, a question: he's getting about 64,000 unique visitors a month, and about 1M page impressions (for the month of September). Is this small, medium, large, what?

Does anyone have any figures for comparison?