The list of Web 2.0 sites is so extensive, there are now hundreds of sites labeled with the “Web 2.0″ tag out there now, and that number is growing by the day.

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Go2Web20 is an awesome little Web 2.0 directory. They have listings of all the different sites and services currently out there, and allow you to browse them by looking at their unique logos. Click on a logo and you will be presented with site information in the sidebar - interested to visit the site? Simply click on the logo again and you will be taken to the chosen site.

You can sort through the logos by the date they were added to the directory, date they were launched, or by tags such as “Address Book” or “Social Bookmarking”. If you know exactly what kind of service/site you are after, you can start a custom search to minimize the results.

If your favorite site is not listed, you can submit is for approval to the directory. They even have a RSS feed for all the Web 2.0 junkies wanting up to the minute updates.

Check it out here, but a quick warning - be prepared to give up hours upon hours of your time getting involved in the Web 2.0 community!

What Web 2.0 sites are you currently a participating member of?