"We infer mechanisms that produce very flat solid surfaces, involving a substance that was liquid in the past but is not in liquid form at the locations we studied," Robert West of the Jet Propulsion Laboratory in Pasadena, US, and his colleagues wrote.Read on at BBC
However, the latest observations were focused entirely on Titan's southern hemisphere. It is just possible the northern region may still contain pools of liquid organic material.
Titan is as dry as a bone

Previous reports stated Titan, one of Saturn's moons, may have methane and ethane lakes or oceans but new measurements with the Keck II telescope in Hawaii suggest Titan is likely solid and dry.