You can use Google Analytics to find the best keywords and shift budget to the highest converting keywords, but what if you're looking to expand your keyword lists? In this post, we are going to look at how you can leverage other free Google tools to optimize your marketing campaigns beyond Google Analytics.

1) Take a look at the best performing keywords from your Google Analytics Keyword Report.

2) Input these keywords, along with your site's URL, into the Search-based Keyword Tool to find keywords not currently in your AdWords campaign. Suggestions from this tool are particularly useful because they're specific to the site and keywords you define, and are based on actual, past Google queries.

3) For each keyword identified, you can then use Google Insights for Search -- a tool that allows you to see trends in what the world is searching for -- to see where regional interest is highest and better optimize through geotargeting.