Apple's voracious use of NAND flash memory for iPhones could be the key spark in the entire industry over the next few years, iSuppli said today in a new study. The smartphone's existence is estimated to help multiply revenue in the business by 5.6 times from its 2008 numbers to $932.5 million by 2013. Much of this comes from Apple's insistence on stepping up the amount of memory with each upgra