Internet encyclopaedias go head to head : Nature
It just goest to show that if two heads are better than one, 10,000 heads are almost as good as several highly paid heads.
Seriously, though, the Wikipedia is vastly superior in at least one way: it's articles are way more up to date. In some cases, scientifc articles are updated hours after discoveries are announced. As opposed to print encyclopaedias, which typically take a year, but really take an eternity because who really gets an updated encyclopaedia every year?