As the title implies, this article is mostly about Titan's methane: how it got there, what happens to it in the atmosphere, how both the release and rainout processes affect the surface. Quite an interesting read.
For those who can't stand edited transcripts, if you have RealPlayer, why not listen to the talk? Or for those who don't have the time to read the edited transcript and just want the nuts and bolts, read my summary.
Thanks to imran at the MER forum for the heads up.