Apple has apparently filed for a design trademark on a handheld computer resembling an iBook without the keyboard. From The Register:
"Hints that Apple might be working on such a product emerged in 2003 when a source close to Taiwanese contract manufacturer Quanta claimed that the company had been hired by Apple to build what was dubbed a 'wireless display...Link
The device is certainly a logical extension of what it's been doing with iTunes and AirPort Express. While its mini wireless access point is good for streaming audio from a host Mac to a hi-fi, it lacks a local control unit. It's tempting to view this latest design filing as the basis for just such a device.'"