The first thing you need to do when picking any niches is to look for new markets or products. There are a couple of ways to do it but generally you need to listen to news or to use Google News in your market research stage. This stage is hard for me to put out any concrete ideas because finding seed keywords is about keeping your ears and eyes open to new ideas. Of course, you can increase your chance if you read more from technology and trend sites but sometimes, luck plays a part as well.
Anyway, one of the biggest thing you must know about is the iPad. Let take this as a seed keyword. It is perfect example of a popular product being introduced into the market and creates opportunities to mine low competition keywords related to this new niche.
For ipad, the market we targeting is the tablet market. Do not target the ipad name itself. Always aim for the product category that it is in. Once we know the seed keyword is tablet, it is time to drill into the market to find those low competition keywords.
First thing is to ignore the google keyword tool. That is always the first destination for every IM folks and believe me when I say almost all the longtail keywords that appear in the tool when you type in tablet will be targeted by other IMmers. See the list below for keywords to avoid!!
click to enlarge
Since you cannot use google keyword tool, what do you use? How about the thing between your ears? : )
Learn how to take that seed keyword and segment it according to different customer types.
Here are a few examples:
Customers who are on a budget or going for deals: Tablet under XX price, tablet deals, tablet for cheap....
Customers who use tablets for only certain functions: Gaming tablet, kids tablet.....
Customers who have design preference: White tablet, 7 inch tablet....
The important lesson here is to use your brain a bit more and the keyword tool a bit less. Once you have the above longer tail keywords, put them into the keyword tool to see what kind of traffic they have. If you don't do a bit of brainstorming, it will be hard to come up with long tail keywords that are not attacked by everyone else using the google keyword tool.
If you see the numbers are small, try using a similar product category that has a good history. In the case of the tablet, I might use laptops as a proxy. So, I will key in keywords such as laptops under 200 to see what kind of volume they have relative to the keyword volume for the single generic keyword, 'laptop'. This ratio can help you to know how big your potential market is if the new market to grow and expand.