Oxypedia, whose motto is "where the shrimp are always jumbo," is an excellent source for oxymorons.
See if you agree with their Top 50 Oxymoron picks, including gems like temporary tax increase, clearly misunderstood, pretty ugly, and many more.
http://www.oxypedia.com/index.php?title=Top_50_Oxymorons - via Miss Cellania (great topic today: English Language)
Sigh. It is impossible to talk about oxymorons on the Internet without someone confusing them with "political statements I disagree with". Usually they're content to stop at "military intelligence".