the good thing about wiki is that it is editable, if a bunch of people come across info they know is not right, someone will probably correct it. but how many people are willing to go through the hassle of correcting bad information in a book? even then there will always be bad editions of the book, even if it is fixed later. wiki is at least up to date. definately not your only source, but it is a great starting point, a lot of times better than google if you just want to find information about something instead of 5 billion websites trying to sell you crap.