One of the most interesting things about BMF is the number of URL shorteners who are advertising here. I know what script they're using and most seem to use Adsense. What I can't work out is how do these sites have such high payout rates? Like $8+CPM? Is this sustainable? Is it because the number of people actually clicking through is much lower than the pageview count? An Adsense RPM above $5 is pretty amazing... especially for such a generic site.