Anybody knows if that kind of technology exists today, at least as a protoype? I mean... somenthing like a beyond-flash memory. Where are the links/articles about them?
Try a search for 'PRAM' or phase-change RAM.
In terms of sheer economy (bytes/$), electronic memory isn't going to overtake magnetic memory for quite some time. However, PRAM promises to be comparable in speed and durability to system RAM but non-volatile (persistent) like flash RAM and supposedly even more scalable (currently you can get 16G flash drives).