tcp port 8311?

we're seeing what appears to be a new large stream of data going outbound on tcp port 8311 and we can't identify a corresponding new application-- destinations are varied, with streams in the range of 50-100MBs each. Do any of you have any ideas what this is, and where to find out more about it? is this a new Napster? thanks, -- Brent Sweeny, Indiana University