I'm starting this thread as a one-stop resource for keeping track of ROM images for homemade cartridges.
Jon's site is the most comprehensive list have found:
Fred Kaal's Mega Mod (128K):
My own games:
TI Scramble: http://atariage.com/...-scramble-clone
Road Hunter: http://atariage.com/...39-road-hunter/
Flappy Bird: flappybird.zip 8.34KB 38 downloads
(also see post #2)
Atarisoft muticart with Ms Pac-Man, Donkey Kong, Moon Patrol and Defender: atarisoft-multicart.zip 67.2KB 55 downloads
(requires a 64K cart that starts up in the highest bank, 32K not required)
Please post links to any other ROM images you are aware of.