NO ADVERTISING IN QUESTIONS OR ANSWERS. Do Not post Ads as Questions nor as answers to questions. Use the Search facility to see if your question has been asked before.
Google offers a free keyword tool which is pretty cool, although I also find Wordtracker to be very useful. Some of the top affiliate are using specific software like Market Samurai, which will really drill down into microniches for you - its all a matter of cost and time.
