The Solar system gets more intriguing as exploration continues. Now it seems there are lakes on Titan. It's by no means definite, but radar pictures are showing smooth kidney shaped areas, similar in size to Earth's lakes, which could contain liquid methane or ethane. The shape of them also suggests they are formed in collapsed volcanic calderas, which might indicate yet another world with volcanic activity!
If only it weren't so cold, it would be ideal for colonisation.