Of course, if none of that works, FedEx and a swing-set of disks works wonders. In a previous job, I was able to get a portable hard disk on site using FedEx long before the file could be zipped, emailed, and unzipped at the other end. The disk can easily be locked by at least one password to protect the content and is actually less potentially at risk of interception than an email. Since a lot of companies have to keep all sent email virtually forever, it's also easier on the email hardware and backups, to boot.