Elliot Borin reports on a new technology that's sounds too damned good to be true: MRAM. Faster than current RAM technologies, non-volatile, and occupying less physical space. Due by the end of 2003. It would seem to be an ideal replacement for RAM in desktop machines much less PDAs and cell phones as mentioned in the article.
However, I didn't see one other relevant factor mentioned: cost. Betcha the stuff ain't cheap.