I wanted to trade Protoshares in the Ripple market. And since there was no gateway for Protoshares (PTS), I decided to create one.
The result is http://www.xrpio.com/
For now, it is only a protoshares gateway, but I plan to add other cryptocurrencies (BTC, LTC, etc) soon.
Anyone want to trade protoshares? Try it out and let me know if you have suggestions for improvements.
Until the market grows, you can use it as a third party escrow service.
Ripple is a great place to trade cryptocurrencies as there is no percentage fee for trading. Gateways may charge a small fee (like mine does), but you can buy and sell with virtually no fee.