For privacy-conscious people it has been obvious for quite some time that using bitcoin is suboptimal. Darkcoin is meant to be the digital equivalent of cash (anonymous, untraceable).
Their DarkSend (
http://wiki.darkcoin.eu/wiki/DarkSend) technology enables this, essentially by acting as a built-in mixer. No longer does the user need to trust her funds to a potentially dishonest third party mixing service.
Support for instant transactions was recently commited and appears, in my experience, to work as advertised (
http://cointelegraph.com/news/113480/darkcoin-introduces-trustless-instant-payment-confirmations).
This coin has been gathering more and more momentum, and the price has reflected that fact, with a jump from $1.7 to $3.0 about a week and a half ago. It's hovering around $2.6 right now, presumably because of the bitcoin turmoil.
Personally I believe that we NEED such a coin with strong built-in privacy features. Most naive crypto users do not seem to understand how to use bitcoin securely (do they realize they are broadcasting their financial life online for all to see?).
I see a good future for this altcoin and considering it's rise in volume, community members(*), price, and continually evolving technical features, I would like to propose that it be added as a MPE.
* reddit: moderately active | forums: active | bitcointalk thread: very active | irc: active