Annytab Code Prettify
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A lightweight plugin that automatically prettifies code in [pre] tags, with linenumbers and without line-breaks.
This plugin uses Google Code Prettify with customized styling. This plugin uses the default skin, custom styling has been applied to show line numbers and to prevent line-breaks. The wp-code-block is styled by the theme (borders, background color and more), the contents of the pre-block is styled by css in the plugin.
This plugin is available for download for your site.