The SEOmoz Top Sites: The 500 Most Important Domains on the Internet http://www.seomoz.org/top500 is a reliable and up-to-date list. It is a terrific resource.
SEOmoz is the most popular provider of SEO [search engine optimization] software.
Unfortunately, no descriptions are put next to the domains.
In future articles, we will pull out what we feel are useful practical websites as a lot of them are technical and not for mainstream interests.
Take a look and ENJOY!
