CPM Advertising with great exposure, great rates!
On a "semi-adult" site. I call it "Semi" because although it's not actually hosted adult material, it does contain adult content links.
Text links $1.00 per 1000 impressions
Banner links $3.00 per 1000
You'll be able to view your stats, and see your click through rates as well.
This site in February, got 6,576,119 hits and 21,091 Unique visitors, and so far in march has gotten 16,807 Uniques and 4,797,123 hits.
Visits to this site originate from the following external links:
This site is regularly featured on sites such as fark.com.
http://boobster.org/ click the advertising link on the left.