I've been a trivia buff forever, and it seems like my brain has an endless capacity for relatively useless information while it has difficulty remembering important things -- like my name, for instance. With over 3,500,000 articles in the English version of Wikipedia, there's plenty of fodder for gathering information, whether it's real knowledge or just fun trivia.
One thing that always amazes me is the connections that you can find in Wikipedia. For example, many times I've found connections between rock bands while reading about a particular musician. I'll find that one of his or her bandmates in a certain band later leaves to play in another band that I like. Those kind of connections are what the iPhone game 3 Degrees of Wikipedia (US$0.99) by developer Ivan Zhao is all about.
Upon loading the app for the first time, a five-screen tutorial describes how to play the game. You need to solve puzzles that link two Wikipedia pages. The example used in the tutorial has you link the "Halloween" page on Wikipedia to the "Candy" page. How would you do that? Simple -- you'd look for a link to an article on "Trick-or-treating," which would have a link to the "Candy" page.