I have launched a currency called “Doom Best Coin” using the Ethereum#ERC20 standard (on the Rinkeby test network). Currently it doesn’t do anything meaningful besides demonstrate that ANYONE can start their own currency.
This is a GOOD thing and one of the primary reasons I was enthusiastic for Ethereum long before its existence. Private currencies are a great step forward for decentralization. There are almost 500 ERC20 coins now in use on the main network, several with interesting concepts. By next year I bet we see over 2 thousand.
Now the question for the world is… which currency do you trust?? Here’s a hint: currencies that say “In God We Trust” or are named “Doom Best Coin” probably shouldn’t be at the top of your list.