The guys over at SixRevisions.com have done a great job of summarizing some great tools for working with your website. For any of you who have only used Google analytics in the past I would recommend checking out some of these other great tools. Especially CrazyEgg and Yslow.

Many of these tools offer a free vs professional version. So you can can test out the free version and when you find them to be helpful you can upgrade to the pro version.

7 Incredibly Useful Tools for Evaluating a Web Design | Six Revisions