The Merapi presentation is interesting - essentially it is a bridge between AIR/Flex and a Java application layer using AMF provided by BlazeDS components. The downside for them is that some of the functionality they have created has been obsoleted by Adobe improvements to the runtime.
The Lego Mindstorm is the highlight of the demonstrations, though the RFID demonstration has its own special merits. However, I would be more interested in seeing demos of the system accessing things like scanners or other USB connected system devices.
Definitely an interesting project, but it is still pre-Beta