Michael brown has recently put up a free podcast where his niche marketing strategy is broken down in a way that's very easy to understand. He's an online marketer who's proven that he knows how to find a profitable affiliate niche and he can help you do the same.
You can find out exactly how he does it here:
Finding A Niche Market: Newbie Edition
Warning: If you expect to identify profitable niches with the click of one button then this training is not for...