Try Matt Barrett's website (sorry, I already tossed all the stuff I printed out, so can't tell you the link). It has a load of stuff about bus and train travel in Greece. Yes, you'd think there'd be bus or train connections from, say, Delphi to Meteora/Kalambaka, but I couldn't find anything definite on that. It appeared you have to transfer at Lamia, Larissa or Trikala. My companion and I finally gave up on trying to do a similar itinerary ourselves, and went with the 4-day "Classical with Meteora" bus trip offered by G.O. Tours (which can be booked through Dolphin-Hellas Travel and I'm sure many other operators). We went to Olympia, Epidavros, Mycenae, Delphi and Meteora, and I was pleasantly surprised at the quality of the tour. I'm sure it's no different from many virtually-identical tours offered by many other companies (and there are lots of tour companies in Athens that can book something for you). As for driving, we definitely didn't want to do that either, less on account of the mts than the horror stories about the Greek drivers, but there was no other practical way for us to visit the other places we wanted to see in the Peloponnese. It's true, the drivers are crazy, but as long as you're alert you'll probably be OK. We took the bus from Athens to Nafplio and back, which is certainly doable, and rented a car from Avis in Nafplio, which was very accommodating (ask for Iannis). I can provide more details if you wish.