As much as I love and adore my Atari 800 and 800XL, I never have gotten into collecting the carts for it! I have a bunch of games and other software on floppy, but I always ended up getting distracted by collecting carts for my consoles and other systems instead.
I only have the my BASIC cart, QIX, Frogger, Star Wars Arcade, Pac-Man, and I can't remember the other one... Bah! I need to try to build up the carts collection for it where I can since I have no idea how to repair any of my floppy drives if/when they go kaput!