When you’re buying ad space on either Google, Yahoo or one of the other online services you need to know the best way to formulate and select keyword phrases.  Here are some of the best tools available to help you understand this new form of marketing.

1. Marketing forums (Very interesting tool that can save you a lot of time. It scans bulletin boards for your keyword and then tells you where that keyword have been found. Simple and effective)

2. Pixelfast.overture (A keyword research tool that will tell you how much)

3. SEO Book Keyword tool from Aarron Wall (A great keyword tool from Aarron Wall from SEO Book)

4. Google Trends (Google Trends, lets you know what is hot and what is not from data pulled from Googles’ data.)

5. Wordtracker (Wordtracker, a keyword research tool that supplies a lot of data.)

6. Google Zeitgeist (Google Zeitgeist, a service from google that breaks down popular keywords by country.)

7. Lycos 50 (Lycos 50 is a report of the top searches on Lycos.)

8. Keyword Difficulty (Keyword Difficulty from SEOmoz)

9. Rankpulse (Rank Pulse reports on the fluctuations in Google rankings)

10. Market Leap (Market Leap is a keyword verification checker and link popularity checker and can work using historical data.)

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