Why do geeks have lust for ZFS?

"In the recent builds of Apple’s new operating system, Mac OS X Leopard, developers have started noticing that there is an option to format a partition using ZFS (Zettabyte file system). There is still no mention from Apple whether this will remain in the final builds, but the file system matches exactly Apple’s plans for Leopard. This article will explain you everything that you need to know about ZFS aswell as why I’m so exciting about its inclusion."