WordPress coding standards http://codex.wordpress.org/WordPress_Coding_Standards Drupal Coding Standards http://drupal.org/coding-standards PHP coding standards http://pear.php.net/manual/en/standards.php http://www.evolt.org/node/60247 Indent Style http://en.wikipedia.org/wiki/Indent_style Microsoft http://msdn.microsoft.com/en-us/library/czefa0ke(vs.71).aspx