Compete.com is an awesome site! You can actually understand it.

1. Powerful Search Analytics
Compete.com has pay-per-use search analytics tool lets you identify rival search marketing strategies to take your SEM and SEO efforts to the next level. However, when you register you get five free credits to your account to try it out.
2.  Comprehensive Site Analytics
Compete’s Site Analytics help you to measure the competition through site metrics and audience profiles for the top 1,000,000 web domains.
3.  Practical Tools
o The easy to install Compete Toolbar automatically creates three alerts for every web site you visit.
o The Compete iGoogle/Netvibes Widget tracks sites directly from your Google or Netvibes homepage.
o The Compete Site Profile extension tracks how any and every web site in the world is performing from your browser.

4. Compete.com has a blog that gives you an insider view of the industry trends, interesting takes on their data, and updates to their services.

Well folks, I joined and hope you do too.