Sometimes we are too busy to notice things that are right in plain sight. I enjoy browsing wikipedia just as I enjoy browsing a real dictionary. You never know what gems you will find when you aren't really looking for something in particular. Would it surprise you to know that wikipedia is just one of nine projects managed by the Wikimedia Foundation?

Follow up:

Wikipedia's sister projects include:

Commons: A free media repository with almost 5 million freely usable media files!
Wikinews: Free-content news.
Wiktionary: Dictionary and thesaurus with over a million definitions.
Wikiquote: A collection of 17,000 quotations
Wikibooks: Free textbooks and manuals (including cookbooks!).
Wikisource: A free-content library with 130,000 texts.
Wikispecies: A directory of species (ok, this is less exciting, I admit, but I did find a really cool picture of a mushroom)
Wikiversity: Free learning materials and activities. Take a course in music theory or any subject that interest you.

There's a lot of free information available and now you have even more places to look for it. Pretty cool stuff in my opinion.