Inspite of the doubts raised over the correctness of information in wikipedia, i guess it has been demonstrated that there are more people on the web trying to provide correct information than incorrect information. In fact, there have been isntances where incorrect information in the most revered book of human knowledge, the Encyclopaedia Brittanica, have been corrected by wikipedia.
http://en.wikipedia.org/wiki/Wikipedia:Errors_in_the_Encyclop%C3%A6dia_Britannica_that_have_been_corrected_in_Wikipedia
Wikipedia : power of open encyclopaedia