CodeRay is a Ruby library for syntax highlighting.

Syntax highlighting means: You put your code in, and you get it back colored;
Keywords, strings, floats, comments - all in different colors. And with line
numbers.

Syntax Highlighting...

 * makes code easier to read and maintain
 * lets you detect syntax errors faster
 * helps you to understand the syntax of a language
 * looks nice
 * is what everybody should have on their website
 * solves all your problems and makes the girls run after you

WWW: http://coderay.rubychan.de/