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Free and simple to use software is preferable but any tips for which i have to shell out bucks are also appreciated.
I have heard good things about it, I installed one version myself and it was pretty simple.
You could also put one together all you need is a redirect/exit script that tracks clicks on a given ad and stores that data in a db. All your ads then use the exit script with a url or id tagged to the end. When someone clicks it counts the click and sends them off to the url.