Installation Info For Keyword Explorer:
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FTP to your web server and create a folder on your domain.

i.e.  http://www.yourdomain.com/RESEARCH/

where 'yourdomain' is your actual domain and 'RESEARCH' is the name of the folder you create

Upload the file research.php to that folder using binary mode

Close your FTP program

Open your web browser and type in

http://www.yourdomain.com/RESEARCH/research.php

where 'yourdomain' is your domain and 'RESEARCH' is the name of the folder you created

** That's it you're installed and ready to go!

USING THE SCRIPT

Type in your keyword or Key Phrase - hit the 'get results' button

Wait for the results (generally 10 - 20 seconds based on connection speeds and number of keywords found)

Related Keywords to your original terms are shown in the left hand column

The next column is a projected number of annual searches for the keywords based on weekly stats
The next column is the number of monthly searches from Overture's data
The next column is an average number of weekly searches
The next column is an average number of daily searches
The next column is an average number of hourly searches
The end column shows how many results are available for that keyword in Google

Tip:
Is the niche worth it?

Always a tricky question and some people love creating products for 'micro niches' I tend to look for niches that have more than 10,000 monthly searches and then 'drill down' into further keyword research.  This ensures you are not creating products for markets with no one interested in your products.