1. Tool: Google Sets
Good for: Compiling keywords for PPC adgroups
URL: http://labs.google.com/sets
A Google Labs innovation, Google Sets helps create lists of keywords based around a common theme. It gives you a choice of a small set (a list of 15 words or less) or a larger set. Simply type in a few terms, hit ‘Large Set’ or ‘Small Set,’ and the app will create a suggested set of other words to fill out your list.