We earlier talked about Adsense for Domains in our post about making money from domains. Google had this AdSense product for domains, but only people with huge portfolios could have access to it.
Today they are opening that product up to all publishers, so even if you have few domains laying around you will now be able to put AdSense on them.
The good news is that it will be more money that what it was possible to make before with the domain parking companies (if nothing else you are taking out the middle man).
To use this feature, you just need to log into your AdSense account and click on the “AdSense Setup” tab, and there should be an “AdSense for domains” option there. Currently it is only available to U.S. AdSense publishers though, but Google should expand it to everyone else soon.