KeywordDiscovery.com, Wordtracker.com and Google AdWords are three places to start.

Also, when you have installed Google Analytics, you can access reports on what search words people used to get to your site. That, in combination with breaking out different keywords sets into different pages, will give you very strong clues as to which search words bring people to which pages. Those search words are likely candidates for high traffic keywords.

When the search words match the page content, the visitor will have a higher degree of satisfaction and will therefore be more likely to bookmark your page or pass it to someone else.

Next tip tomorrow...