In most of the standard Drupal themes, the Preview, Publish and Delete buttons are styled in the same way, which gives equal visual weight to each button. Arguably the most dangerous would be to mistakenly click on the Delete button and wipe out a draft post!

This simple tutorial shows how to style the three buttons so that the Publish button is most prominent, Preview is next and the Delete button is displayed almost as an inline link. Excellent notion, slightly marred in that the solution isn’t particularly accessible for those with poor or no vision (I think the guidelines say that you shouldn’t use color to provide meaning).