Darkcoin
Darkcoin actually has proof of concept of true anonymity,
from the wallet, and will be integrated into the current wallet in a week or so (after making sure it's stable). It is worthy of note, and that's not to mention the 11 algorithms that make up the proof of work. Very difficult to translate to GPU's let alone ASICs It'll be a cpu miner for the foreseeable future. This is important because it makes the coin and it's rewards attainable by all, therefore more people will mine it, and therefore it becomes more difficult to attain >50% share of the hashing power. It also has a flexible unique difficulty level, so it remains a viable place to mine, without giving away the coin.
Frankly, this coin is the best put together coin that I've seen so far, but I'll admit, I don't know it all
https://bitcointalk.org/index.php?topic=421615.0 
