If you have a forum CPM ads are a godsend. For various reasons. CPM ads can put up the individual click price quite significantly(of CPC adverts). Theres also the point CPM is advertisers who want to advertise with you is quite positive feedback that your doing something right. You can't choose to have CPM adverts because Googles AdWords system for CPM is site targeted, not keyword targeted. As such the advertiser has to go through a directory of sites and choose the ones they want to advertise on. With recent changes to AdWords they can also choose CPC adverts instead of CPM adverts for site targeting. Pierce