Wordplay

Chiasmus.com
The definitive website on chiasmus and chiastic quotations. Dedicated to making chiasmus a household word.
http://www.chiasmus.com/

Oxymoronica.com
Dedicated to the oxymoron and the paradox in intellectual and literary history. Plenty of examples provided in quotations, titles, and a table of phrases.
http://www.oxymoronica.com/