Putting your sponsored link on the Wordpress.org homepage will cost you $20,000 per day (also available are $100,000 per week, or $250,000 per month). While according to AdBrite the Wordpress front-page only gets 16,000 page views per day from over 10,000 visitors, it has a PageRank of 9.
http://blog.outer-court.com/archive/2005-10-13.html#n89
http://www.adbrite.com/mb/commerce/p...=45963&afsid=1