I spent quite a bit of time (Via Google, Yahoo, etc) looking for them myself. The problem, though, is that the high paying keywords (Mesothelioma, home equity lines of credit - uh, well, maybe that one's not so high paying anymore

) and the other legendary keywords have LOTS of competition. You won't get to p. 1 , 2, etc of any search engine for a long time. Better idea: Explore keyword
niches using Wordtracker or other tools that will tell you of high search volume keywords with little competition. These sites use an algorithm that compare the Number of searches in a recent period vs. the number of websites using these keywords. The lower the number of websites that use these keywords the better.
Example: Early in my domaining career I bought a domain name related to the food safety scares and China that I thought would get alot of traffic. I originally planned to focus on
human food safety issues. However, I did a Wordtracker analysis of the keywords I thought I would use, and it turned out that there was much less competition (and, it appeared, nearly as many searches) concerning
PET food safety. So, I adjusted my site content toward PET (focusing on dog and cat food) safety issues.
In summary, high search volume with less competition will yield more success than high search AND high competition.