Quote from Cache Landing:
Everyone here knows that I don't very often agree with rcanfiel, but I do wish that people would quit acting like Wikipedia is any less accurate than other sources.
Especially on important topics, wiki is very scrutinized and quit to fix errors. In my certain areas of expertise I've found more errors in textbooks used at major universities than on Wikipedia. Wiki is becoming (if not already) one of the most reliable sources for quick reference available today.
Not to mention, if there is new info discovered, results of medical/science studies, or other things, it makes wikipedia a lot quicker than it make the desktop encyclopedia. It also usually has a heck of a set of links to other related info.