Based on this, I thought i'd put together a quick list of 7 free keyword research tools to help you with your IM efforts...
1. Google search-based keyword tool
The Search-based Keyword Tool provides keyword ideas:
* Based on actual Google search queries
* Matched to specific pages of your website with your ad and search share
2. Google AdWords keyword tool
This tool gives you approximate keyword search volume statistics for Google search network and because of Google growing and dominating search network, you really can get pretty precise results.
3. Google Insights for Search
With Google Insights for Search, you can compare search volume patterns across specific regions, categories, time frames and properties.
4. Google Trends
Compare the search popularity of multiple terms across a defined period of time
5. SEO Book Keyword Suggestion Tool
* Offers rough suggested daily search volumes by market for Google, Yahoo!, and MSN.
* Links the search volumes to the related global search results.
* Provides links to price estimate tools from Google AdWords. That Google AdWords tool shows the necessary bid to rank #1 for 85% of queries, and roughly how much traffic you could expect AdWords to send you based on that bid price and ad position.
* Links to Google Trends, Google Suggest, Google Synonyms, Yahoo! Suggest, and Keyword Discovery keyword research results.
* Links to various vertical databases like Topix.net, Google Blogsearch, and Del.icio.us to let you know if people are talking about your topic and what types of resources they are referencing.
* Is driven off the Wordtracker keyword suggestion tool. If you sign up for a Wordtracker account they offer many additional keyword research features and tools that are lacking in our basic keyword tool.
KGen (Keyword Generator) is a Firefox extension that allows you to see what keywords are strong on the web page you are visiting.
7. Wordtracker SEO Blogger
SEO Blogger is a Firefox plugin that allows you to find the most sought-after keywords for your subject without ever leaving your blog editing screen. The tool sits alongside whatever blog publishing software you're using so you can do keyword research and optimize your posts as you write. Then, simply hit "Publish" - and you're done!
Hope these help
Feel free to suggest any I've missed. Could turn into a great resource!