Added CryptoNight algo with Monero for start:
http://www.whattomine.com/coins/101-xmr-cryptonight

Please report your 280x hashrate/wattage if you mined it.

Edit: Added more CN coins:
http://www.whattomine.com/coins/102-fcn-cryptonight
http://www.whattomine.com/coins/105-qcn-cryptonight
http://www.whattomine.com/coins/104-xdn-cryptonight
http://www.whattomine.com/coins/103-bcn-cryptonight