Checkout these great sites for information about measuring & improving your website's performance

GoDaddywww.godaddy.com
The webs premier service for purchasing internet domains

Search Engine Watchhttp://searchenginewatch.com
A site with lots of articles about different aspects of SEO which are updated daily

SEO Bookhttp://tools.seobook.com/keyword-tools/seobook/
The premier web resources for SEO, features a free SEO Bootcamp & a ‘Google Spider View’ that allows you to see what the google spiders see when they visit a website

Spackywww.spacky.com
Will tell you the monthly search volume of any topic & its related phrases on Google, Yahoo & MSN

SpyFuwww.spyfu.com
A great site for Spying on your competitors Pay Per Clip campaigns & their effectiveness so you don’t waste marketing budget on unproductive adwords

Website Graderhttp://website.grader.com
An analytics resource that grades any website 1-100 based upon metatags, links, optimization, SEO friendly labeling of pages, pictures & media

Quarkbasewww.quarkbase.com
Quarkbase is the best way to find website information
contributed by website owner, lover and the Internet Community

Dan Schawbel Personal Branding Bloghttp://personalbrandingblog.com
Dan Schawbel is the leading authority on the subject of personal branding through Web 2.0 technologies

Google Webmaster Centralwww.google.com/webmasters
Your one-stop shop for webmaster resources that will help you with your crawling and indexing questions, introduce you to offerings that can enhance and increase traffic to your site, and connect you with your visitors.

Alexawww.alexa.com
Free web traffic metrics, top sites lists, site demographics, hot urls, and more...