It would be nice if a community member or two could make a crypto-currency work on ARM proccessors; the top cpu architecture used in mobile devices. Since Litecoin is the crypto-currency of CPUs, this seems like the most viable candidate.
Why? Well, you could start mining with a Raspberry Pi for only $25 (http://www.raspberrypi.org/
). I find that pretty cool. You could also theoretically mine on used iPhones, iPod Touches and other discarded devices. Support could be brought to payment networks with little start-up cost and little energy by anyone. People in lesser-off parts of the world could make a living off the world's electronic waste. This helps people, further decentralizes the benefiting currency while making it stronger.
Another possible pro is this could lead to less electronic waste in our environment.