With so many mail scanners rejecting mail with .zip attachments (which so often carry malware payloads), some sites are moving to a “.piz policy.” Need to send a .zip attachment? Rename it to filename.piz and instruct recipient to rename it back. A pain in the neck, but effective if you can manage the user education component. Hopefully .tgz will remain unsullied for a while, but I predict that all compression formats are ultimately doomed as simple attachment formats.
Music: New York Dolls :: Trash