Ari Balogh, CTO at Yahoo! just offered a preview at Web 2.0 Expo of a very new kind of Yahoo!. One that invites developers to take advantage of our huge scale to write applications that build on our existing properties (think Mail, Sports, Search, our front page, mobile, My Yahoo!, etc.), tap into millions of loyal users, and make Internet experience more relevant and useful.
Something Awful has a flat out hilarious (if somewhat long in the introduction) article on the nerd bias of wikipedia. The point isn’t to say that one article or another on Wikipedia has factual inaccuracies, but rather to show how much more attention certain topics get than others.
There's been plenty of debate over the past couple of years about the merits of Wikipedia, generally focusing on how "trustworthy" the site is because of its anonymous contributors and lack of professional editorial review.