Sonnet Technologies has released the Tempo SATA Edge ExpressCard/34, an eSATA card for laptops. The company says that this card is so small that it can be left inside a notebook computer’s ExpressCard/34 slot even when not in use. The installed card fits even with side of the the laptop.

Sonnet's Tempo SATA Edge ExpressCard/34 has a single external 3Gbps eSATA port, supporting single drives, and multi-drive enclosures with port multipliers or  RAID controllers. It can sustain data transfer speeds of up to 125 MBps read and 110 MBps write, about twice as fast as FireWire 800 and four times as fast as USB 2.0.

The card works in laptops running Mac OS X 10.3-6 and Windows XP/Vista/7.