>Some form of a webDAV, possibly 'skinned', comes to mind, as >shared rights and ACL are well defined and readily supported; >Clients in every Linux, OS/X or Windows release in active >support [also on my iTouch and related portible devices], so >far as I know; server side is trivial; uses the 'universal >firewall traversal protocol on TCP/80 (plaintext) and TCP/443 >(TLS) ;) Is it actually called "skinned"? Sounds like what I need...