Much has changed in Keywordville since Google AdWords For Dummies was last updated.
For free keyword research, here's where I go now:
1. Google's own Keyword Tool, found in AdWords and accessible without an account here
As things as constantly changing, I'd appreciate your feedback. Which free keyword tool do you find easiest to use, and most useful? Are any links on this page broken, or a waste of time?
You can leave a comment below, and the rest of us will be grateful.