Ickalanda on 31 July 2008
This was found a long time ago. I already knew about it.
The probe Huygens from the Cassini-Huygens Mission landed on Titan on January 14th, 2005 and noticed that lakes were on Titan. This announcement is just after researching the data they have confirmed it and know what liquid it is, I guess they weren't allowed to say anything about it prior to that before they had gone through the scientific research.
http://www.nasa.gov/mission_pages/cassini/main/
And after reading further their they had just confirmed it but it had pretty much been known before just further studying had to be done also to confirm that it was still liquid and not frozen.
