I have posted this before on a few forums to get a range of different feedback and ideas.
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Adultindex.net is a search engine that is clicked based and runs on a 1/5 ratio.
For every 5 clicks your users make you get 1 point, once you reach 1,000 points you can place a text add online. This will give you 200 targeted clicks in return (that is not blind clicks either). You can specify to either have the ad show up in one category, search words or both used on the search results page only. Good for paysite sponsors.
If you want a quick look at the control you get, check this out.
http://www.adultindex.net/webmasters.php
Login: deano
Pass: password
I'm open to thoughts and suggestions.