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Sell Advertising Space
Perhaps selling ad space should go under "Your Product" (the ad space) or "Some Else's Product" (whatever they're buying the advertising for), but whatever -- if you've got a website (and it's not hosted somewhere that doesn't allow commercial websites), you can make money by selling ad space on your site, and depending on how you do it, you don't even have to know who's buying it.
For example, you could put Google AdSense ad blocks on your site and get paid each time someone clicks one. Google takes care of deciding which ads to display on your site, or if you allow "site targeting", advertisers will be able to specify that they want their ad on your site.
AdSense-like ads are also available for ClickBank products using ClickBank's somewhat limited in-house ad system, or third party systems like Instant Affiliate Accelerator.
More to come here...
* Amazon.com best sellers displayed using CaRP Evolution with expanding reviews powered by CaRP's "Expander" plugin.