I have written two Ubiquity commands so far. If you have Ubiquity installed, you should be prompted to install commands when reading this page.
Drupal tools contains two commands, drupal and drupal-api.
drupal (node ID)
drupal opens the corresponding node on drupal.org.
drupal-api (function name) [on (drupal version)]
drupal-api, featuring suggestions, looks up a Drupal function on api.drupal.org, optionally with the modifier on (drupal version) to choose a Drupal version other than 6. Versions are in the format dn, where n is the version number, so d5 would mean Drupal 5.