When searching for fresh keywords to use for Adsense blogging, you have to seriously weigh the advantages and disadvantages of this endeavor. New keywords have no CPC rates or data to how often they will be searched, so their earnings potential is hard to grasp.
On the other hand, fresh new keywords have no competition for exact keyword domains and page authority and it can become easy to rank before the buzz begins. These types of websites have the highest amounts of risk and the potential for strong earnings if the buzz is good enough.
The best place to mine these new keywords is in the technology areas as new products come out all the time and people start searching for the latest news. But as in the war for new DVD formats has shown, those who backed the HD format over Blu-Ray now have dying websites. So be careful if you choose to build sites off of keywords that have not been tested.