Ripple had some kind of agreement with Citibank.
of course I think this stuff is a complete joke - centralized digital currencies like Ripple will never gain mass acceptance. Maybe Citibank can trade Ripple with other junk banks but they're already doing that with their $Fiat scrips and other papers.
^ Indeed. Ripple seems to be doing a great job engaging people - including banks - and introducing them to these new concepts and technologies. As a tech, I don't like it, but I can see why banks might warm to it (two small US banks adopted Ripple very recently).