Wikipedia

Wikipedia is a useful website.
You can find information on any topic you could ever think of.
It is an online encyclopedia you can reach from any computer connected to the internet via a browser.
Each topic, for example "Pope John Paul the 2nd", is available in different languages.
Some topics are not available like "snoopyDoopdooGa's life" because they are so obscure no one ever thought about them.
Anyone can post information to the site to enhance the content.
http://wikipedia.org/
There have been some bad features going on when some US congressmen put disputed articles about rival party members on Wikipedia. (That happened at a date I can't recall.)
Anyway there are not only bad tricks going on over Wikipedia. You can find a lot of accurate information in the science fields, like the distance between the earth and the moon. Maybe because they are more undisputed and don't provoke as much emotion as other topics dealt with by human beings.
Rational and scientific stuff on Wikipedia can be trusted in my opinion.
I know that some teachers (at the University level) in the United States refer articles to their students that come from Wikipedia.
Wikipedia can be trusted to an extent, but of course anyone doubts topics like the description of a sect could stay undisputed, that's why in my opinion we can't trust those type of topics.
Members from the sect are likely to say that everything is wonderful in the religious organisation while victims who escaped from it are more likely to denounce mental manipulation from the guru, and so on...
It is also useful to get English words translated or explained! This is useful to foreigners or non native English speakers!