There has been a lot of mention about using it with hard-wired 
installations.  That's all well and good but to fit our original model, we 
can't rely strickly on hard-wiring.  Some of it has to be IR, some has to 
be RF and some has to be power-line carrier.
I'm going to look into using CAN via a PIC micro and their CAN interface 
chip.  Surely we can add IR/RF/PL to the other side of the chip, not just 
wires.
This will be a good step in the hardware direction.  Since I work my job 
quite a bit, it could take a couple of weeks for me to get one of those CAN 
chips and play around a bit.  If anybody else has some hardware/software 
stuff in this line please direct it my way so I can have a peek at it.
John Mullan