So here's the deal. I run a weight loss messageboard. I got contacted by a weight loss surgeon who was asking what price I would charge per month for a link or banner ad on my messageboard. As far as banner sizes go I could offer a 468x60 or a 120x240, a 120x120, 120x60 I guess I honestly have no idea what I should charge! The link or banner would be visible on every page of the site. I get about 1500 visitors a day, about 1100 of which are absolute unique visitors. The homepage is a PR4, and many of the sub forums are PR3/PR2. I am not sure if this is a factor in what I would charge, but only 10% of my traffic comes from the country of this weight loss surgeon. Does that play into anything? He asked me and I told him, but he seemed OK with that.