I just wanted to add that Kwikset SmartCode uses Z-Wave as well (I do not know if Z-Wave is a new feature of that product, but it seems like it is). I hope that it will be available outside of the US so that a smart person, who has experience with Z-Wave and the proper tools, can add it.
I just googled Z-Wave, and i found OpenZWave. It seems that Kwikset is a better lock & there is "some" interest in that lock.