Drupal - Can I move a webform to another drupal installation?

You didn't say what version you are using but if it is drupal 6, there is a module for that exact purpose.

http://drupal.org/project/webform_share

Edit: Since posting this, the module has been updated with a Drupal 7 branch as well.

I'm not familiar with webform_share, but I have had good experience with a module called Node Export, which works pretty well with webforms, and notably with webforms where the form is integrated with CiviCRM via the webform_civicrm integration module.