Titan Streams?

The first pictures are just coming in from Cassini-Huygens mission to Titan and they are spectacular and very curious from a geological point of view. Rocks! The interesting part is it looks to me with even my limited hydrogeology training that we are seeing a dry stream bed of some kind. The rocks appear sorted which you commonly see in a creek. I did read an early science release where they are alluding to streams of methane. This is going to be major news, as well as a wealth of work for geologists world-wide.