This is a useful technique i found thats alot different than the 'look around the house' or 'use stumbleupon categories' approach to niche research. Good for CPA keywords especially, but works for everything.
The idea is to use a system to filter out all the crap(competitive stuff, low volume) and then manually check for monetize-able winners. Kinda like searching for expired domains/2.0s, except for keywords.
So one way to do that is take a tool like ahrefs and put in a big…