WOW -
c-cex is not secure.
polo is not secure.
only crptsy [and mintpal] left...

I really believe that when DRK gets attention, increase at least x3 fold, and generates trading volume, BTC-e would be a perfect candidate exchange to add it. If i were them, i'd probably remove feathercoin in order to add DRK... or novacoin,
But until then, we are down to just one 'serious' exchange trading DRK 
not good