About cheat commands, well it's easy you can enable it if you make worlds in MC 1.3.1. You have to get into talk mode (Do this by pressing T button on your keyboard then just type a message starting with slash or / ). for example if you type /help , this command will show you all of the commands available , and for /help 2 will get you a second page of potential commands.
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Next interesting command is /gamemode. This command will switch survival and creative mode, and you can also put your world into adventure mode with this same command.
Onother important command is /publish. With this you can open your world to the LAN if you friends want to play on your map (depending on what LAN you are using and where).
The amazing thins in MC 1.3.1 is that it turns you into a server administrator for worlds you create on your own computer. it's really a good improvement, and most computers can handle a couple of additional players being added.
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