Here is a detailed list of top paying google adsense keywords from domain name and web hosting field. This is one of the best paying niche along with medical and finacial fields. The data is obtained directly from google's tools itself. But no claims are made about the accuracy of the data, due to the volatile nature of the adwords keyword bidding.
Disclaimer: Google, Adsense, Adwords are registerd trademarks. We are not affiliated with google and make any claims about the accuracy of the data.