4. New Lessor Known Tools from Google, Google Insights for Search Tools, Videos available

Most informative. Try it out -no risk.
1. Google traffic estimator sandbox
Traffic Estimator
Get quick traffic estimates for new keywords without adding them to an account or using the AdWords sign-up wizard.
2. Adwords Keyword calculator
Don't be scared by the the pay-for Adword service here it's free for 1st order limited but highly informative use to bloggers.

Use the Keyword Tool to get new keyword ideas. Select an option below to enter a few descriptive words or phrases, or type in your website's URL. Keyword Tool Tips

WARNING from GOOGLE "Important note: We cannot guarantee that these keywords will improve your campaign performance. We reserve the right to disapprove any keywords you add. You are responsible for the keywords that you select and for ensuring that your use of the keywords does not violate any applicable laws."

Normally the intelligent user will write his post and ideas. The keyword tool may be useful to improve the bloggers choice of subjects to blog or when a multiple word choice may be allowed to express the same idea or concept.

I trust Google will be ethical in rewarding effort?

3. Google Search based KW tool
The Search-based Keyword Tool provides keyword ideas:Based on actual Google search queries.
Readers will also find these links on my Google Tools side bar menu RHS.

4. Google Insights for Search tool
See what the world is searching for.

More....