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One way to estimate the number would be to pick 200 random sites. See how many use Strongbox, or how many use NATS or whatever. If X% of your random sample uses Strongbox, probably roughly the same % of all adult sites use Strongbox.
Let's say you find that 4% of the adult sites (40% of pay sites) use Strongbox. We might then be willing to tell you that 50,000 sites use Strongbox. If 50,000 is 4%, there are about 1,250,000 adult sites.
Similarly you could count how many of your 200 random sites are in the Yahoo directory. If 1% are in the directory, and the directory has 10,000 sites in the adult categories, there must be about 1,000,000
sites.
Joe is doing the writing. Any volunteers to do the counting?
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