29Dec/0813
How I make 15K a month at AdSense
I start with keyword lists from adsenseheaven dot com which guesstimates the most expensive keywords to bid on in the PPC AdWords side of the Google ad world. I generally ignore the top 1000, as they are very competitive and saturated. I am not concerned with the top payouts.
I store this data every month in a mySQL database with the previous months data, and over time I am able to see which phrases are consistently in the lists and unlikely to disappear. I call them long term performers.
I cross check each phrase with the number of pages currently indexed in google, to see how much competition there is for a each key phrase. It's usually easier to land a top 10 first page SERP position if there is less competition for the phrase.