Keyword Tool Options
You have probably heard by now that the Google Keyword Tool is being replaced by the Google Keyword Planner. People don't seem overly pleased with this decision and are wondering which tools to use now. I don't find the new option to be as user friendly, so was pleased to find this post that walks you through how to use the new Google Keyword Planner.
Another popular option, that has a free version, is WordTracker. It is limited to what you can do without then having to pay for the privilege, but you can still get a general idea.
This video shows how I have been using Google's predictive search to find good keywords for my blog posts.
What keyword tools do you use to do keyword research?