PhobiaGuide.com - List of Phobias
Really good list of the most popular (wrong word?) phobias that are out there. Great resource for those who're stuck with niche ideas
To be honest with you some of the phobias listed are really crazy and I don't think that someone would buy an info product on how to get rid of that specific phobia, but who knows... Nowadays people are spending thousands on some crazy s***...
Hope it helps.