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Source for this information is http://www.develop-online.net/news/42216/Millions-of-PlaySpan-user-IDs-and-passwords-leaked-online
I did a bit of digging, and found that Playspan and Ultimatepay are connected (at least as corporate entitiies), so if you have an Ultimatepay account, and feel the need to lock down some MMO accounts you have, change the password for that along with any MMOs connected to Playspan, which appear to include a number of games.
EDIT: Just editing this original post. I based my information off of the report at Develop, but wasn't able to update my post till just now (fell asleep, bad form really). Updates over at Massively (http://massively.joystiq.com/2012/10/10/security-breached-in-playspan-hack-multiple-games-affected/) and through commenters here indicate that some of the games listed aren't connected to PlaySpan anymore. I apologize for getting overly paranoid and scaring the heck out of people. That said, if you did have a PlaySpan account with the same or similar credentials to a game account, you may want to change your passwords as a precaution.
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