Monstrous Menagerie II: Hordes & Heroes has a launch date! Mark your calendars for November 12th, 2024. 300+ more monsters for your D&D 2024, or Level Up: Advanced 5th Edition games, plus new horde rules and rules for heroic monsters who level up alongside you--whether they be allies, companions, or foes! Click here to follow on Kickstarter!
d20 Transformers would totally rule.
d20 Battletech would be awesome too.
In fact, d20 <anything with giant robots> would be really cool IMHO.
d20 Alternity
d20 Fallout
d20 Fantasy Sports Leagues!
d20 Street Fighter
d20 Pokemon
d20 Shopping
d20 Quake
d20 Burn a CD and see if you have a coaster
d20 Car buying
d20 Dating
d20 Motocross
d20 Work
d20 Monopoly
d20 MadTV vs Saturday Night Live
d20 X-Com
d20 Black Hawk Down
d20 Fiest
d20 Civilization
d20 Cooking
d20 Las Vegas
d20 Laundry
d20 Pr0n
What about the orignal suggestion? d20 Fill-in-the-Blanks? That would be great you could build your own game with all the 'fluff' text written out for you.
For example in the PHB replace the word 'spell' with 'pants' - makes it a whole new game doesn't it?
Or 'player' with 'contestants' and 'melee' with 'eat' and.....
In another thread someone brought up the idea of a d20 Time Bandits. That would be fun.
In terms of 80's american anime rip offs, Jayce and the Wheeled Warriors had the best vehicles, but I think that Battle of the Planets would make for the best d20 game.
Oh, and as far as Snow Crash goes, I thought that the first 80% of the book was sheer brilliance, but the end was kind of crappy. The amazing occult science-mysticism that made it so good gave way to a Power Rangers episode.