Ever since I first played this game, I thought it would be a great game to hack. Thus, I've spent the summer developing a program to help me disassemble the ROM, and eventually pick the game apart.
I just finished my first revision of the disassembly--you can find it here. (Be warned most of this was created automatically and may not be 100% correct!)
The next thing on my list is to create a ROM and RAM map. I'll also use this thread to post anything interesting I come across or to annotate certain subroutines.