This mod has become so popular that many mods require it in order for them to run.
Installation
Windows:
1) Open up %appdata%, if you don’t know how to do this, start>run, then type in %appdata%
2) Browse to .minecraft/bin
3) Open up minecraft.jar with WinRAR or 7zip.
4) Drag and drop the necessary files into the jar.
5) Delete the META-INF folder in the jar.
6) Run Minecraft, enjoy!Macintosh:
1) Go to Applications>Utilities and open terminal.
2) Type in the following, line by line:
cd ~
mkdir mctmp
cd mctmp
jar xf ~/Library/Application\ Support/minecraft/bin/minecraft.jar3) Outside of terminal, copy the class files into the mctmp directory.
4) Back inside terminal, type in the following:
rm META-INF/MOJANG_C.*
jar uf ~/Library/Application\ Support/minecraft/bin/minecraft.jar ./
cd ..
rm -rf mctmp5) Run Minecraft, enjoy!
via Thread: http://www.minecraftforum.net/viewtopic.php?f=25&t=80246
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