Event Webform Templates?
This is more of a Drupal answer than a CiviCRM answer, but I believe you can use Node Clone to copy/duplicate webforms.


  The clone module allows users to make a copy of an existing item of site content (a node) and then edit that copy. The authorship is set to the current user, the menu and url aliases are reset, and the words "Clone of" are inserted into the title to remind you that you are not editing the original content.