I have many posts that include lines from configuration files. I have previously used custom CSS to make those lines more readable. Now as I migrated to Drupal I wanted more generally used solution. I found some discussion around this theme from here: http://drupalmotion.com/article/syntax-highlighting-drupal After taking some time to familiarize myself with the matter it was an easy decision to choose GeSHi. It is perhaps a bit of an overkill for my needs but I have some spare CPU cycles and hard disk megabytes so why not.