Are there any services hosting Bitcoin-related ads for websites? Say one owns a Bitcoin-specific website and they want to get some ad revenue for Bitcoin-related ads. Are there any websites that host such ads and provide the necessary code for displaying and monetizing them, just like AdSense would, or does one have to contact individual Bitcoin websites and strike deals with them?
There is not anything like adsense yet, but there are smaller ad platform. Here are a few:


http://dailybitcoins.org/ they offer both ads by number of impression and per click.
http://www.bitcoinadvertisers.com/ they claim to be the biggest, I do not know how true that is.
http://anonymousads.com/ They have a significant presence in the Bitcoin community.
http://puppytwist.com/ they are pretty simple to get started with, high payout too