Interoperability is, well, sort of a moot point as far as ooooohhhh 
browsing files.  Woop-de-doo-eee.  To tout interoperability is silly, as 
is simply showing a server.  Why don't we demonstrate a couple of 
clients (any os, I don't care) with full directory services, 
authentication, group policies, integrated with web-services, CRM, show 
a oo database running it all, the stuff that big iron does.  There a 
multitude of directory systems that exist for linux, bsd, solaris, 
whatever.  Don't show people software costs, they are meaningless.  Show 
little companies that there are VERY VERY valuable and useful cool shit 
that linux does cheap that would make them money.

Is this different than what most home users are doing with linux?  Yep.