In some of my sites, I don't want to include Submitted by in each post. Going to content type admin settings, I can disable that line entire line including the timestamp of posting, but that is not my requirement. I only want the author information to be remove or to hide.
Here's how I solve this case:
Edit node.module under modules/node directory. In Drupal 7.15, the section that you need to edit is in line 1469
vi +1469 node.module