I run an ad network that represents sports blogs, and it is in the process of selling 125x125 sidebar ads. These ads would be displayed accross six blogs that get over 50,000 uniques per month. You would have your ad displayed on the following sites: http://juicedsportsblog.com http://gridirongoddess.net http://sportsagentblog.com http://sportsbusinessdigest.com http://sportsloungeblog.com http://kidcleveland.blogspot.com Price would be in the range of $1.5 CPM, so $80. You can also advertise on an individual site for $2 CPM. (It's monthly cost, but I'm just using CPM based on monthly traffic.) PM me for more details or if interested.