For any idea that you may have, take the broadest theme keyword you can think of and do a search on it to see how many other people are looking for these items. Keyword phrases are what people are searching for. Each one represents a potential market of people ready and willing to buy through your links on your website. If you used the Google Keyword Tool, you will find that the list of what people are looking for is amazing and goes on and on. You can then check Google's search results to see how many websites are directly competing for the term.
Some ideas that you can consider may be a favorite vacation spot, certain tourist attractions in and around where you live, an expert knowledge from your current job, a personal passion, pets, crafts, and even a hobby. But you should not stop there. You have to dig deeper into these ideas until you find a small niche market that has a high demand but is barely competed.
Of course, a website targeted at one market alone will not make you rich, but if you do that several more times, offer more products to the same niche market or find a bigger niche market, then you will be able to make a very good living out of your niche website ideas.
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