The idea of replacing hard disk drives with flash memory has been gaining steam in the IT industry. But a research group at Stanford University is going even further: they say the goal should be to replace hard disks with DRAM.

via Can DRAM replace hard drives and SSDs? RAMCloud creators say yes.

This seems to violate the KISS principle.  The comments in the above article are also interesting.  RAM disks have been around since early DOS days.