I just found a site called nichetaxi.com and you can search for a keyword and they say if it's a possible niche for adsense or not and give you a Nichetaxi Factor... What do you know about this site? is it good or just a waste of time?
grrr, you need to register. Out of curiousity, I'd like to see what they offer/suggest but I don't think I'd use their services.
Here's a little tip. Research them yourself! Find a niche on your own will ensure that it doesn't get swamped with competitors and you can create a whole network of related site and dominate that market. Also, it is more satisfying and rewarding, although admittedly time consuming, to watch your own researched niche grow and make you a good amount of money. Doing your own research also ensures that you are completely aware of all the factors involved, including competition, expected CPC and traffic levels for specific keywords.
I don't completely agree with Jambo. It is important to write in a niche that people are actively searching for. There is no purpose spending hundreds of hours on a niche that nobody is going to read. It is a good Idea to check http://inventory.overture.com/d/searchinventory/suggestion/ or https://adwords.google.com/select/KeywordToolExternal
A niche in my view is a site that does get traffic. Otherwise, in my view, it is not a niche I owuld choose to follow. I use wordtracker within my research process to find a good balance of expected traffic and cpc.