I have access to two popular keyword reserach programs, NicheCracker, and LongTail Pro(Before you ask, I impulsively bought NicheCracker, and my friend has Long Tail Pro). I have read the manuals, but I want to know how you guys go about finding keywords and EMD's for amazon sites. Do you guys usually have a niche in mind before you do keyword research? Any advice would be greatly appreciated. Thanks!