I though I would mention that Catherine Neish et al. have an interesting paper in press with the International Journal of Astrobiology:

The potential for prebiotic chemistry in the possible cryovolcanic dome Ganesa Macula on Titan
C.D. Neish et al.
International Journal of Astrobiology, In Press, 2006
doi:10.1017/S1473550406002898
Published online by Cambridge University Press 22 June 2006
Abstract http://journals.cambridge.org/action/displ...sue?iid=249160#

I've read the preprint, and it's pretty interesting, I must say.

What makes papers from this group so exciting is that each one sets the parameters for a whole new field of scientific enquiry. They are doing the Big Imagining that reveals new vistas in tantalising outline. Cynics might say there is an element of propaganda here, but I think this is not only brilliant science but brilliant science advocacy. Titan deserves them!