About a year ago I got involved with sending traffic to companies who have built co-registration paths that automatically optimize the advertisements shown to the audience. For example, if you have job traffic, some of these companies have a job co-reg path that displays job related offers that convert best based on your audience. Some of these companies will even go the extra step and build an entire co-reg path based on the type of audience that you have.
I know of some affiliates who were doing as much as $5,000-$10,000 a day sending traffic to a co-reg path. Basically it work as a revenue share between you and the co-reg network.
Below is a full presentation on co-registration that was given at my Traffic-Leads-Conversions seminar last year, which explains this opportunity. I have also included Powepoint slides of the entire presentation. Enjoy and I look forward to your comments.