One of the most popular Bitcoin alternatives by trading volume has been Litecoin.
A service to track profits earned for virtual currencies provides what you might call a "Google Finance" for alternative currency portfolios.
Robocoin Kiosk, a machine that lets people buy and sell bitcoins, will be demonstrated at the #Bitcoin2013 conference this weekend.
Google Ventures and China-based IDG Capital Partners place a bet on OpenCoin, the company behind Bitcoin exchange Ripple.
Amazon has handed 500 "Amazon Coins" to each of its US-based Kindle Fire customers.
Bitcoin isn't the only form of electronic money being mined, traded and spent these days.
A CoinDesk Q&A with Stan Stalnaker, founder of Hub Culture and the Ven digital currency.
Amazon is set to launch its own in-house currency -- Amazon Coin -- this month.
Bitcoin's long-term chances of success are better if there are many other alternative, digital currencies, with many businesses investing in them.
Amazon is launching its own currency later this month. Amazon Coins will only be exchangeable for Kindle applications and games and initially US only.