Update 04/19/2007: Doug Lombardi, director of marketing at Valve, contacted DailyTech with the following statement:
There has been no security breach of Steam. The alleged hacker gained access to a third-party site that Valve uses to manage the commercial partners in its Cyber Café program. This Cyber Café billing system is not connected to Steam. We are working with law enforcement agencies on this matter, and encourage anyone with more information to e-mail us at
Catch_A_Thief@valvesoftware.com.