ComputerCraft - 17 February 2012 - Minecraft files

ComputerCraft is a Minecraft mod (with full survival and creative multiplayer support) which adds in-game computers. Each computers comes with its own operating system featuring a host of builtin programs, and can be programmed to do anything you want with the easy-to-use Lua programming language. Each computer has a screen and keyboard, a comprehensive help system, a fully featured file system, two awesome games (including a text adventure based on Minecraft, and a fast paced arcade action game) and the ability to send and receive redstone signals in all six directions (including RedPower bundled cables, allowing for a full 96 bits of I/O).

New in version 1.2, you can now build Disk Drives for your computers, and carry your files around the world on Floppy Disks (or send them down Buildcraft Pipes or RedPower Tubes for the ultimate in automation). To liven up your home, Disk Drives can also act as programmable record players.

Since the release of 1.0, many prominent mod reviewers have recorded spotlight videos of ComputerCraft, and many talented players have recorded videos of their amazing creations. Instead of cluttering up this thread with videos, here's some links to the best YouTube content so far:
[Mod Spotlights, Reviews and Tutorials]
[Best of ComputerCraft]

INSTALLATION
For Players:

Install [Risugami's ModLoader] 1.1.
Install [Flan's ModLoaderMP Unofficial] Client 1.1 v2
Download ComputerCraft Client 1.21 from one of the links above, you will get a zip file called ComputerCraft1.21.zip
Extract the contents of the zip somewhere on your computer, if you do this properly, there will now be a folder called ComputerCraft.
Copy this new folder (not the zip) into the "mods" folder in your minecraft directory.
If you've done all this right, you should now be able to run the game, and start crafting and placing computers.
If you get error message about bios.lua when attempting to the use a computer, you've done something wrong, re-read the instructions and try again.

Hydrogen made a really good Installation video for Windows users.

For Server Operators:

Install [Flan's ModLoaderMP Unofficial] Server 1.1 v2
Download ComputerCraft Server 1.21 from one of the links above, you will get a zip file called ComputerCraftServer1.21.zip
Follow steps 4-7 from the Player instructions above.

GETTING STARTED
First off, build a Computer:
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Then, right click on the screen to interact. You're now in the command prompt. Type "help" to get started, then type "programs" to see the list of programs you can run, and try running some of them. Type "help" followed by the name of a program to find out what it does. When you're ready to start creating your own programs, type "help programming", then use "edit" to create programs or "lua" to just start entering code. All the programs and APIs you can call have their own help pages.

Want more? Build a Disk Drive next to your computer, and craft some Floppy Disks:
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-Download-