For the GM, there is a description of the world, together with a rational of why the world is the way it is, and some comments on why this world is better to game in than the more standard Cyberpunk type worlds.
Two of the major differences between the world of Snowcrash and other cyberpunk worlds is the universal computer network, the Metaverse, and the common form of large corporations, the franchise.
There are a couple of pages on creating characters. One deals with rules, another with new skills, advantages, and disadvantages, while a third deals with ideas for characters. Since characters tend to come in groups, there are ideas for creating groups of characters.
There are also several useful lists:
There is one long term campaign under development: