A fantastic resource for generating niche ideas is none other than.......
Entrepreneur Magazine! For example, this month they have an article about young millionaires where they profile them and talk about their businesses. But what I really like about this magazine is that every single month there are stories about people who started their own businesses, sometimes in the most obscure markets!
Entrepreneur Magazine | Entrepreneur.com (no affiliate link)
They even have a tablet issue. They also profile success stories in some of the most boring, mundane markets such as selling light bulbs, jewelry made from cockroaches, light switches, mummifying dead bodies, and so on an so forth.
Most bookstores and news stands carry it. If you're looking for niche ideas, this is a great resource. I mean going to Discount Magazine Subscriptions & Deals | Magazines.com or Amazon.com: Online Shopping for Electronics, Apparel, Computers, Books, DVDs & more are good resources too, but this magazine uncovers niches I would have never thought of! (There are no affiliate links here).
Another thing you can do is go to any search engine and type:
And you'll find a bunch of websites that already give you niche ideas. Some of them will even e-mail one niche idea per day or per week.
Another way to find niches is to go to any search engine and type phrases such as:
"How do I.....?"
"How to cure.....?"
"What do I do if.....?"