We have got two ad spots available on a celebrity blog that gets over 80k+ views a month. The ad spots are 125x125px just under the header and they are available for $30 for 30 days. You can get more details or purchase the ads here: http://puxee.com/buy/website/146/
Websites in our network have CTRs between 0.2% - 3%. It varies a lot by month and website. I believe a CTR of around 0.4% is the average for this site. The ad is right at the top and is one of the first things the user sees. A well targetted ad could see a higher CTR.