The New York Times describes Fusion-io, a start-up Steve Wozniak has joined:
The company relies on high-speed flash memory, commonly used to store data on an iPod or digital camera. Fusion-io takes many flash chips and packs them together on a module that is a bit bigger than a deck of cards. The module slides into certain slots inside servers. That gives the main computing chip quick access to data stored on the flash chips. In traditional systems, servers must hunt for data on separate storage systems linked to the processor by a slower connection.