I wrote about the need of redundant drives in all computers that we use.
Now, the hardware seems to be almost ready. Via Engadget, I saw this Micro Mini Hard Drives from Iomega. It seems to me that there are 4 1-inch drives in this credit card sized unit. It is just a matter of adding some circuitry to make it a RAID drive which connects to any computer via a USB port.
In fact, the 2.5-inch form-factor for most laptop hard disk should have enough space to put 4 to 8 1-inch drives in, making an internal redundant drive system possible.
Hardware manufacturer, listen, here is a potential category killer for you to exploit!