This site was created to ease sharing of code snippets. There is a lot of features, most prominent of which are:
Syntax highlighting. More than 70th languages are supported (most likely that your favorite is supported too!), along with configuration syntaxes of such software as Apache, MySQL, etc.
Ability to change your paste with history monitoring: you can look at any version of your text and see difference between them. Just like in a wiki!
Ability to highlight important parts of the code: prepend the line with a [HTML_REMOVED]@@@[HTML_REMOVED] symbols and you[HTML_REMOVED]re done.