Juice Analytics created a visualization framework, “JuiceKit,” that integrates power of Flare Visualization Library with Adobe Flex, and result is Analytics Visualizations, two visualizations powered by Google Analytics API. You just need a Google Analytics account to explore your own data. Here’re quick details about visualizations:

• Referrer Flow shows you about what sites’re linking to you and what content’s benefitting the most? It's a stream of daily treemaps showing pageviews and bounce rates for various groupings of your website's pages. Clicking on treemap’ll filter all data by page, referrer or url that you clicked on. Click again to clear your filter.
  
• Keyword Tree visualization displays most frequently used search keywords and how they’re used together. You'll see frequently used search term at center and words & phrases that’re most often used in combination with that word.
  

More info: Google Analytics blog