The perfect complement for this would be a reboot of the BeOS-style filesystem. For the unaware, BeFS combines the attributes of a hierarchical filesystem and

The perfect complement for this would be a reboot of the BeOS-style filesystem. For the unaware, BeFS combines the attributes of a hierarchical filesystem and (some of) a relational database. It could do interesting things like store contacts as a zero-contents file which had key-value pairs for things like names and email addresses. There are some open-source reimplementations of it, thanks to the Haiku project; I wonder if they've ever been integrated with the Linux kernel and distros.