In Germany we have a special law. It says that no Provider or Website have the permission to save IP-Addresses. If a user send over the webform module a message, the module saves the IP-address of the visitor. We need a option to disable the saving of ip-address.
I know that Drupal for default saves IP-addresses in Logs etc. I use for this the anonymize Drupal module. http://drupal.org/project/ip_anon
Maybe if a visitor see it that we save full ip-address data we can have a conflict with him and law.