http://searchmarketing.yahoo.com/

This tool will help you to find more relative and popular keywords for your site pages when targeting traffic from yahoo search engine.

The major feature of this tool is that it shows the total count of monthly searches made for a given keyword on yahoo search engine. Keywords with high search volume are marked separately with an exclamation mark indicating that the term is highly popular but has more competition. The figures shown in results are only estimations. Based on your target audience you can also find keywords which are specifically popular in a region or city.

How to access the tool:

This research tool is not directly accessible, so one has to go through following pathway:

Signup > choose I’ll setup my own account > select geographical area and time zone > click get started > entire market or specific regions > click ‘next keywords’ > input keyword