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I didn't know about this until frank pointed it out - there's actually a wiki for rom hacks out there. It's quite neat. Go to the Super Mario Bros. 3 page, for instance, and you see all the hacks the community knows of for that game, so the one where the enemies are replaced with Spiderman villains, or the 'lost levels' patch, which allows access to development-only incomplete levels. Then the patch for the rom is linked. It's very well laid out into each console, then alphabetized. So there's a section for NES, SNES, GB/GBC, GBA, Genesis, and N64 (not much in that one though). As you can imagine, the bulk of the hacks are for the NES (there's even a Sesame Street ABC hack called The Muppets Take it all off). Anyway, really nice place, and worth a look if you're into that sort of thing. And of course, if you have hacks of your own, that's the place to put links to them!
Check out the Rom Hacking Wiki
It should go without saying but no asking for or posting Commercial Rom Links.
