I understand your "enthusiasm" for Marty to continue working on Nestopia; however, do you honestly think Marty wants to continue development, or forgot about Nestopia and the message boards?
As Richard pointed out above, Marty has not logged in since June 2009. Being the programmer of Nestopia, I'm sure if Marty wanted to continue this project he would. Posting Marty's contact information or other means to reach him outside of what was provided in the documentation included with Nestopia, seems a tad rude and selfish to me.
Marty has done more than enough for this project and persisting to try to have yourself or others, quite frankly, *nag* him about it, will accomplish nothing, but annoy and perhaps further distance Marty from ever looking at Nestopia again.