How about a Zork style room-model file system? You are in Foocorp documents. East is Bloggins&Smith, south is Vexcorp. You can see Foocorp.xls Bob is here. J

How about a Zork style room-model file system? You are in Foocorp documents. East is Bloggins&Smith, south is Vexcorp. You can see Foocorp.xls Bob is here. Jane is here. Bob says "Jim, can we go over the numbers for Foo?" > Use Foocorp.xls with Excel (Excel starting...)