Hi, Diomedes. We're glad you unlurked!
There's been a lot of research on abiotic routes to life over the last half-century, much of it by Miller himself. There's a new paper by Powner,
et al., Nature, v 459, pp 239-242 (2009) that shows a fairly plausible route to the ribonucleotides that go into RNA. Some of the paper is pretty heavy chemistry, but I'll be happy to send you a copy of it and of a commentary from that same issue - my email is in my profile.