Notepad++ plus Drupal
In case you are using Notepad++ as an editor (pretty common for themers/developers on Windows) you might be interested in this Drupal code-assist/autocomplete. The readme with instructions is included, but you might want to check this and this thread for additional help. It worked for me, but there are limitations. Still it might be worthwile to check out if you don't want to use a real IDE like Eclipse, which has far better integration with Drupal.