Wikipedia is a very useful site for anyone looking to find information on any given topic. Chances are that you have used it for research at one time or another. Even if you don't start by going directly to Wikipedia, results from the site are often at the top of search results in Google, and you'll get there anyway.
Those Google results likely play a significant role, but Wikipedia's popularity is as great as ever. Right now, it is cited as the fifth most popular site in the entire world. It gets 325 million monthly visitors, and the number of visitors grew 20% in the 12 months ending in September, according to the Wall Street Journal, citing data from comScore.
The WSJ also says that the number of editors Wikipedia has is dwindling. They say thatWikipedia lost over 49,000 editors in the first three months of 2009 alone. During the same period the previous year, Wikipedia lost only 4,900 (WSJ attributes these figures to Spanish researcher Felipe Ortega. His thesis on the subject can be found here [pdf]).
The accuracy of information on Wikipedia has always been something to be leery of, simply because of the open format of it. If you give the public access to things, some people will abuse it. Even if their intentions aren't bad, they may still just post inaccurate information. Wikipedia's has taken measures over time to try and weed out the bad, by making stricter policies for content addition. These days, altering or contributing to Wikipedia content is no easy feat.
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