Alexa is a very powerful tool used to rank web site traffic. Find out how your web site traffic stacks up against all your competitors! ..

1. Yahoo! – Personalized content and search options. Chatrooms, free e-mail, clubs, and pager.
2. Google – Enables users to search the Web, Usenet, and images. Features include PageRank, caching and translation of results, and an option to find similar pages. The company’s focus is developing search technology.
3. YouTube – YouTube is a way to get your videos to the people who matter to you. Upload, tag and share your videos worldwide!
4. Windows Live -  Search engine from Microsoft.
5. Facebook – A social utility that connects people, to keep up with friends, upload photos, share links and videos.
6. Microsoft Network (MSN) – Dialup access and content provider.
7. Myspace – Social Networking Site.
8. Wikipedia – An online collaborative encyclopedia.
9. Blogger.com – Free, automated weblog publishing tool that sends updates to a site via FTP
10. Yahoo Japan