WP Code Highlight

Just activate it and put source code between 'pre' tags.

Works out of the box just fine.

Also supports line numbers and 4 coloring themes.

Installation:

Unpack and upload it to the /wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress.

What is new in this release:

• Removed unused JS files.
• Optimized CSS.

What is new in version 1.2.7:

• Some optimizations.

What is new in version 1.2.5:

• Add settings link.

What is new in version 1.2.4:

• Detailed usage.

Requirements:

• WordPress 2.7 or higher