Over at Jeff's Gameblog there is a discussion about how D&D has always been a sort of frankenstein of games. I was discussing this with my friend Sam, talking about using board games and such to illustrate aspects of the game world. Like using Catan elements to set up a region and play out how the region works. Or use Carcassonne to come up with a map of a city and it's outlying settlements.
I was quite taken with Jeff's idea (though I don't think he is conscious of it) that you can have completely different rules for players and DMs. Or even different types of characters that have different types of rules as Rob Conly points out in the comments.
Awesome! BYOR Roleplaying! (Bring Your Own Rules)
This begs further investigaiton. :)