Mintcoin has potential.
Mintcoin is about to be the first full proof-of-stake coin to develop a mobile wallet for Android with full minting capability. This is huge. Mintcoin doesn't need miners to secure the blockchain, heck, it doesn't even need computers, all it needs to run is a cellphone. Mintcoin is fully energy efficient, and is extremely fast with 2 minute transactions.
http://i.imgur.com/J9yqsW6.pngMore:
https://bitcointalk.org/index.php?topic=450381.0 