Advert management/Affiliate system on Forum Site

This project is a minor one and a add on to an existing site which is already receiving lots of visitors [login to view URL] apart from Google adsense, there is no other way of moitizing the [login to view URL] now needs an advert management system(ad rotators) and Affiliate system as ad-ons. Details- Ad management must be able to handle various kinds of banner sizes as well as client area where advertisers can track their campaigns. The affilaite system should give all users the ability to refer members to the site, with an affiliate area that shows how many people they have refered. Members are also being paid per new posts and per new topics [login to view URL] the system should be able to keep track of amount in USD due to each member based on number of posts and referals. To have a glimpse of the site visit [login to view URL] .