Google Insights for Search can also be broken down by category. This is very handy if you want to see a comparison of searches for "prop," but you only want to see searches related to stage props, and not the props you find on airplanes. By selecting the category "Theater & Performing Arts," you will filter out the irrelevant results.
The difference between Google Insights for Search and Google Analytics is that Google Insights shows overall search trends while Google Analytics shows specific trends for a single website. Anyone can use Google Insights, while Google Analytics must have a tracking component placed by the website owner.
Google Insights for Search is located on the Web at www.google.com/insights/search/