Language, words, origins, like that
Social Security Administration
Words from Down Under - Aussie slang
Cockney rhyming slang
Tongue twisters. Thousands of them. In languages you've never HEARD of even.
MORE tongue twisters (thanks, Christina!)
More serious stuff
World Wide Words - word origins
The Word Spy
Engrish, Janglish, Japlish, call it what you will. Only the way us gaijin butcher Japanese could be funnier.