If you are someone like me that is currently trying to profit from niche websites, than you might interest to automate the process like what I have done. I used to spend hours to do keyword research.
The basic things that you need to know how to dominate niche market
I will walk you through the steps that I used to do. In this case we will find the most profitable keyword for our main keyword "home theater".
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Get the list long tailed keywords. Go to Google keyword research tool (https://adwords.google.com/select/KeywordToolExternal). Here I entered my main keyword then I expect to get the list of long tailed keywords, lets try "home theater". Then save the result as excel format.

Now you should get a list of long tailed keyword for your niche market.

In next step we will try to get which one that has less competition. The less competition that you have then the more easier to dominate. This is our goal.
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Get the competition of each long tailed keywords. Go to google.com. For each keyword you have in the list, do search and get the number of competition. See the top of right side of google search result. Write the number of competition of this keyword in your excel file.

Remember that you should repeat this step of each keywords. Right now I have 150 long tailed keywords in my hand which each of them need to be checked. :) If you are a lazy person like me, you can have this step done with SEOkicker keyword research tool which I will explain later.
When you finish, you should make them in a sorted order from the lower competition to the higher one. Pick the one that have the less number of competition. You should also consider the number of search per month for this keyword. You have this number with Google keyword research tool that you have done in step 1. I usually pick the keyword with minimum 1,000 searches per month. The higher number is better. For the number of competition, I usually will choose the one that below 500,000. The lower number you have, the easier to dominate.
Ok, in this case I pick my long tailed keyword "denon home theater". It has 33,100 searches per month and the competition is about 325,000. Not bad.
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Get the domain name for the most profitable long tailed keyword. This step is an optional for some of you. For me that willing to make many niche websites, I usually invest for the domain name.
Go to your favorite domain registrar and do domain search with your keyword. Here I will search for denonhometheater.com.

If you are lucky you will get the dot com domain name. I usually register the dot net or dot org domain, rarely find the dot com, the dot com domain is quite hard to get today. Sometimes, I also add the prefix or postfix word to the keyword to get the dot com domain name. In this case, I will also look for something like denonhometheaterguide.com. You can see that here I added the word "guide" in order to get the dot com domain.
How can SEOkicker safe your time
Now I'm going to introduce you the software that save hours of my time and if you are doing the same thing with me right now, I think it will also help you as well. Here I try to automate the process for number 2 and 3 which these 2 processes usually take hours to complete. This software is called SEOkicker keyword research tool.

Enter the domain extension. If you do not want to search the domain, just uncheck them all. You may also enter the domain prefix and postfix if you like.
You need to copy/paste the keyword list that you have in excel file to the keyword list box in your SEOkicker. Then hit submit button.
Wait a few seconds, then you will get the work for step 2 and 3 done for you.

With this search result, I can easily judge which one is the most profitable long tailed keyword list. I also be able to save hours of my time doing keyword research. Now I can allocate my time that I used to spend for keyword research for rewriting my PLR articles and do more website promotion.
Don't buy SEOkicker unless you have read this
First, this is not a windows based software. This software will run in your webhost. It require PHP enabled in your webhost. This software uses CURL and socket connection, make sure your webhost enabled this function too. But you don't have to worry. Most of webhosting provider will support them. SEOkicker doesn't need any mysql database, so basically installation should be very easy as easy as uploading the files. If you still having problem, I'd be happy to help you to install into your webhosting account.
Ok, I almost forgot to tell you that why SEOkicker is server based software. The benefit of being server based software is that you will gain the ideal speed of network connection. You will get the result much faster than when it's done within your windows desktop.
Second, I do not recommend if you want to make your SEOkicker installation become a public service. You make this as a service and put something like adsense hopefully people click and make you profit. You can do this, but I do not recommend. Why? The software will send query to google as many as the keywords that has been entered. If you run so many queries to google, I'm afraid google will do something nasty to you. It also send query to whois server. Too many queries within a certain time could make their server slow, so they may limit the number of queries you can do within a certain time duration.

