There is a basic Z-Wave driver (
https://github.com/ninjablocks/ninja-zwave ) but (at least to me) BLE and ZigBee look a lot more interesting at the moment. Lots of fun gear being released for both, and decent mobile support for BLE will lead to some interesting stuff.
That breakout board just provides the pins already on the Pi. The Ninja Pi Crust has an Arduino on-board and provides compatibility with existing Arduino shields, as well as wireless 433mhz communication (to turn lights on and off etc.).
(Disclosure : I'm a Ninja, and yes... an Aussie :)