I want to make reservations for a domestic flight via the interent, show up at the airport with my ID and get my boarding pass. Are any of the Thai carriers set up to do this? (I'll be arriving on an international flight if it makes a difference) If e tickets aren't happening here, what are my other options? Thanks in advance.

Bob

THAI is set up supposedly for e-ticket booking online so you could give their website a try.  Be advised that when THAI first starting doing "on-line bookings", after making a booking one had to then go to a THAI ticket office and actually purchase the ticket.  I know they have improved the booking system since then but I'm not sure whether it's now functional in the sense for which you are looking.

Barring that, you should be able to purchase a THAI domestic ticket from a travel agency wherever you are.  Not sure about the other domestic carriers though.

With Bangkok Airways you can.

With Thai Airways you can, with their Royal e service attracting a 10% discount on domestic fares.