Form Factor
Interesting enough, Red Planet, a pretty decent 2000 sci fi flick (with good special effects) starring Val Kilmer and Carrie-Anne Moss, shows what a device would look like equipped with a flexible display and it's one everyone would want. When OLEDs are combined with capacious solid state memory, fast processor and an interface similar to the iPhone/Minority Report, a smart brick comes to mind because without moving parts, power requirements will drop like a stone, reliability would greatly improve and the devices will be able to handle physical abuse that would kill today's portable systems. When WiMax and open access to RF becomes real (let's hope the FCC doesn't blow it but...), these devices will be everywhere.
Addentum. Sony's entry's not bad either.
'Nuff Said