If I recall, Dazq was investigating connecting digital to digital. I suspect it got put to one side as he has been doing a lot of work integrating speeduino into CAN. CAN is the system that allows the various peripherals in a modern car to communicate With each other. It may have been this he had in mind.
The ldperfomance sensor works very well with its normal analogue set up. Once you have the sensor bung welded to the exhaust, then its very simple to install and configure. Its very responsive. I was tuning the idle on carb with it, and could see the afr change as I turned the idle mixture screw.