[Nephilim]

Just FYI, Raph Koster, author of "A Theory of Fun," just finished blogging a series of articles that describe the process they used to create the resources system used in Ultima Online. Some interesting stuff in there if you're looking to build a more environment-based RPG (as opposed to scripted, console-style). Here are the three articles:

Part One is about the underlying data structures.

Part Two is about the application of those data structures to the virtual world.

Part Three is about the future directions they didn't get to pursue with UO, and an ample source of ideas for your own creations.

Those articles reminded me of the permeating magic discussion we had a while back, and makes me want to go back and revisit it. Heh.
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Visit the Sacraments web site to play the game and read articles about its development.