I have four "Featured Link" spots and four "Partner Link" spots on a proxy directory. Featured links should be proxy related, partner links can be anything (although I reserve the right to refuse sites.) The site gets between 3500 and 4500 uniques per month leading to 20K to 30K page impressions per month. More than 90% of this traffic is direct from search engines, mainly Google but a share from Yahoo!, ask.com and Live Search. This tells you a little more: http://tinyurl.com/3bz92x $5 per month per spot $12 for three months per spot Here are a few screenshots from last month's traffic details...
If you can offer a review spor for 3 days - in order to see the results - I am interested in purchaing (after I evaluate the results)