WP Code Highlight provides clean syntax highlighting and it also provides a code button.
This plugin was developed for another plugin - CodeColorer (http://wordpress.org/extend/plugins/codecolorer/), but easily can be rewrited to another s
SmartAss Highlighter is extremely simple and easy to use syntax highlighter for your code. Shortcode - [highlighter]
Enables CodeColorer for any code block created by the markdown-for-wordpress-and-bbpress plugin.