Certainly who knows better than Google, which keywords are popular and how much is the competition for a given keyword. After long time this tool now hosts some of the most expected features that people have been waiting for like search volume in terms of numbers. This detail information helps users to make a sound decision while arriving at final keyword selections.  

A set of keyword tools - all in one compiled to provide a one stop keyword analysis, comparison and solution centre. These tools comprises of all the data from leading source database and updates them periodically.

After discontinued Yahoo Overture tool now its back with a new bang tightly integrated into the yahoo search marketing tool. You can find the popularity of related keywords on yahoo search engine. It should be noted that the indicative search figures displayed by this tool is for monthly basis.

An advance keyword research and analyzer for finding the popularity of a keyword. Watch market trends for keywords and use this intelligent data to pick your finalized set of keywords.

A great tool from Aaron wall which helps you in qualitative and relative analysis of keywords. The calculation of results are based on the assumption that Google having 70% of the market, Yahoo! with 20% and MSN search having 8% of the market. To provide the different approximations of keyword statistics this tool uses word tracker API.