Wikipedia

(If you've seen wikipedia, don't bother reading this.)

Argh... If you haven't heard of wikipedia (the free encyclopedia anyone can edit) yet, look at it now.

Some interesting articles:
Melbourne
Fubar (crude language)
John Howard (not that I like the guy)
Harry Potter
The Beatles
Ancient Rome
And some that I find interesting (but that you may not):
Open Source
Terry Pratchett
Infinite Monkey Theorem
Triple J
Python Programming Language

If you're a schoolteacher, this page will answer many of your questions:
Wikipedia Schools' FAQ

Want to edit an article? Add a tip about your favorite recipe, maybe? Add a fact about your town? Have a glance at the welcome page first: Wikipedia welcome page.

The easiest way to look up articles is to type "wikipedia Monkey" into google and hit "I'm Feeling Lucky". If you're using firefox, you can type this directly into the address bar, and it will do an I'm Feeling Lucky search for you.