A microchip which can store information like a hard drive has been unveiled by US company Freescale. The chip, called magnetoresistive random-access memory (Mram), maintains data by relying on magnetic properties rather than an electrical charge. One analyst told the Associated Press news agency that the chip was the most significant development in computer memory for a decade.  Mram chips could find their way into many different electronic devices. The benefit of Mram chips is that they will hold information after power has been switched off. Freescale has been producing the four-megabit Mram chips at an Arizona factory for two months to build inventory.

quote:
The MR2A16A is a 4,194,304-bit magnetoresistive random access memory (MRAM) device organized as 262,144 words of 16 bits. The MR2A16A is equipped with chip enable (E*), write enable (W*), and output enable (G*) pins, allowing for significant system design flexibility without bus contention. Because the MR2A16A has separate byte-enable controls (LB* and UB*), individual bytes can be written and read.

http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MR2A16A&srch=1

512 KB...only cough...

What about these:
http://en.wikipedia.org/wiki/Twistor_memory
http://en.wikipedia.org/wiki/Bubble_memory
http://en.wikipedia.org/wiki/Ferroelectric_RAM

A little more info from a BBC news article:

"Unlike flash memory, which also can keep data without power, Mram has faster read and write speeds and does not degrade over time.", and "Mram chips could one day be used in PCs to store an operating system, allowing computers to start up faster when switched on."

I love that "someday" shit, don't you?