Don't know what to write about? Even better, sort of know what to write about but don't know if it'll be a successful search term for your site? Keyword Chef helps you find those hidden keywords that will rank and bring you traffic.
Use it as a thought starter. Or it can help you determine if that "great idea" for your next blog post is worth writing up.
Pro tip: sign up for the free account. Then go through the email tutorial and the help videos so you know how to use Keyword Chef. Then use the sample searches on the site's front page to play around before you do your first search. That way you don't waste your first batch of free credits.