Forum Moderators: skibum
Cookie the visitor (used in conjunction with a session variable for best effect).
Then log the 'content areas' of your site that they visit & are interested in.
Monitor based on click stream the usage patterns of the site in conjunction with the responses to the advertisement(s) that you are showing to them.
Rinse, repeat, until you see a pattern emerge.
There you go -> demographic targetting at it's finest. What's this got to do with your sites?
Well, if you are getting upwards of 10K uniques per month (as I think many members do) then analyzing these macro trends will enable you to steadily push upwards the performance of your advertising, resulting in greater revenue.
Lower than that, perhaps, and such macro analysis might lead to false positives, though I don't know personally how to calculate the beta for such things to yeild a 'significant likelihood' probabilistically.
For me, I favor fuzzy analytical methodologies based on possibilistic mathematic principals, they tend to yeild a higher ROI at a faster pace, though through convergence, it is theorized that the two methods would arrive at the same conclusions.