Now that the Cassini probe is nearly to Saturn, some scientists decided to see just what an ocean would look like on Titan, if one actually exists:

Wind speeds of 20 km/h produce waves five metres high (16 feet). This is seven times as high as those produced on Earth by the same wind speed, although Titan's lower gravity makes the waves more widely spaced and slower moving.

It'll take the Huygens probe's final decent to find out for sure, but it definitely sounds exciting.