I love 80 char limits. Thanks to larger screens we can make that a soft limit too! I find that it still makes a crazy about of sense, especially when it comes to readability. I believe that's covered in chapter two of the Linux kernel coding style? "The limit on the length of lines is 80 columns and this is a strongly preferred limit."
Thanks nix! I love that summary. It saves me from having to read anything or do any of my own research and still sound smart when I explain it to others! :D