I am offering a 125x125 ad spot for one week; normally, it costs about 512-1024ec per day to advertise on my blog (popularity rating of over 1000 at the time that I am writing this). Your ad will replace one of the "your ad here" graphics on my website (or one of the ads right above the Entrecard widget):

http://www.globallyrational.com/

If I don't have any other ad requests after your week expires, I'll leave your ad up for another few days.

If you don't have a good 125x125 ad yet, I also offer graphics design services; I can design a 125x125 ad for 250ec. If you purchase an ad on my blog, I'll offer 100ec off of any graphics design service.