The SideShow feature in Windows Vista lets you put an auxiliary display on the outside of a notebook PC, and the implementation in the Asus W5Fe has excited CNet's Crave column. It even has an Asus W5Fe with SideShow video.
The notebook has a 71mm (2.8-inch), 320 x 240-pixel display in the lid, and CNet says: "Conceptually it's like having a PDA strapped to the outside of the laptop."
Another idea is to have a wholly separate PDA or DAP (digital audio player) connected via Bluetooth, say. or able to slot into a dock. That's what Dell has done, according to Engadget (photo below).
Engadget says: "Nothing official yet, but what you're looking at is a 'production-ready concept design' for a DAP that's supposed to pop into a dock on your laptop or desktop where it would double as a SideShow display. The model we spotted sported 1GB of storage, Bluetooth (no word on A2DP), and touch-sensitive controls."
