Modules to keep techie nerds happy

BUEditor (http://drupal.org/project/bueditor)

A plain textarea editor aiming to facilitate code writing.

GeSHi Filter for syntax highlighting (http://drupal.org/project/geshifilter)

Requires installation of (non-Drupal specific) GeSHi library.
Provides a filter to highlight source code using the GeSHi library (Generic Syntax Highlighter)