I believe this would be a perfect project where a lot of people could contribute:
http://www.mobygames.com/game/dos/neverwinter-nights_/screenshots
Since the game is a real RPG with multiplayer features.
Several artist could all be working on different things. (characters, locations, items)
Several programmers could be working on many different things. (travel system, battle system, guild system, party system, events)
Writers can showcase there true talents as this could be a true story instead of little descriptions about things or introductions. =]
Also with the latest technologies, the game will not have to rely on refreshing everytime after actions.