Agaric wants Drupal-native (or Redmine/Chiliproject) checklist storage, sharing, and use for things like the not-yet-ultimate web site development and deployment checklist.
The Drupal 7 road map of Checklist module looks very helpful but it is moving slowly.
The ability to have tasks link to how-tos, to be able to share and re-use lists, with user or project-specific tweaks, would be fantastic.