That would definitely be a good idea for a large Star Wars game.
You're right - it's fantastic for large-scale sci-fi games. I'm setting up a forum like that for sci-fi RPG even as we speak. I've GMd a lot of games, and I think for sci-fi, having a whole forum is the best way to do it. There are folders for planets of note, technology of note, a character roster, important histories, an In-Game thread and an OOC/ applications thread.
The histories and informational threads are set up so only the admins can post and edit, which means that the admins have to really keep on top of things and make sure all the folders stay updated and organized. But I love that format for any large scale RPG with lots of little details that need to be understood to write well in the game.
						