Quoting BLuKnight

Actually, if you were to have a flash drive that ran off your MB or the PCI bus, you'd find it much faster than your hard drive. Eventually, you'll have your OS on an internal flash drive (5 to 10 gigs) and all your programs will run off the hard drive. This way, you're running the OS out of memory that doesn't disappear when the entire system is shut off.

Actually no, I'm quoting the speeds manufacturers give for the flash media, not what speed it will reach due to interfaces, so it is still only 2MB/s-15MB/s regardless what you connect it to. It may eventually be faster than your HD (MAY) but it's a far cry from replacing system RAM. Mine clocks in with a throughput of around 3000MB/s, thats a little higher than 2MB/s.