I am a fan of Wikipedia, the largest multilingual free-content encyclopedia on the Internet that anyone (well, almost anyone) can edit. I refer to it all the time.
This site started in started in January 2001 and has grown in leaps and bounds since then. I am proud to say that I have started several articles as well as contributed to hundreds on Wikipedia.
Of course, some have criticized the site for "flawed editing policies" but I can assure you that any wrong or biased information on the site is removed in a day or two and sometimes, even in a few seconds.
Found this great Wikipedia extension that makes editing of pages on online encyclopedia easier by adding a toolbar to the Firefox browser. tell me what you think?
In case you haven't check out why Firefox is the best browser.