Rapid growth in internet use over the past decade has created an interesting challenge for businesses everywhere: how to accurately measure what people are doing on the Internet, sort them into the appropriate audiences, and engage with them? These tools will help you conquer these SEO challenges. Enjoy.

Alexa - A useful resource for people to discover information about websites. You can use Alexa to discover how popular a site is, see visitor trend patterns, find related sites, learn who owns a site, and much more. Get the Alexa Toolbar.

Quantcast - Measures and organizes the world's audiences in real-time so businesses can buy, sell and connect with those that matter most. Quantcast engages all U.S. Internet users, providing audience profiles. Get Quantcast.

Google Analytics - The enterprise-class web analytics solution that gives you rich insights into your website traffic and marketing effectiveness. Google Analytics, allows you to write better-targeted ads and strengthen your marketing initiatives.

SEO Chat - Aggregates a number of different SEO tools so that the everyday website owner can quickly find highly relevant data involving meta-tags, keyword optimization, site link analysis, and much more. Use SEO Chat.

Keyword Discovery - Collects keyword data from different search engines (SE's) and compiles a range of search related statistics. Keyword Discovery provides you with real search data and enables you to maximize the available SE traffic.