WOW! I got it working! Thanks Pepe. Here is what I did to get the code working on my Arduino Mega 2560 with Glediator:
1) The interrupt vector in the code is for an Arduino Uno (ISR (USART_RX_vect). Changed to ISR (USART0_RX_vect) for the Mega 2560
2) Change the char variable 'go' to a boolean. Why this worked, not sure.
3) Removed the auto-reset on the Mega board by removing the trace on the board. If I need to load new code, I simply bridge the pads with a wire.
Now.. for the fun !!
Thanks Again !