SharpZaurus

As opposed to the HP Ipaq, the Zaurus series from Sharp are native Linux PDAs with a Linux distribution from Sharp (SharpROM) and a Qtopia desktop.

There are currently five different generations of the Sharp Zaurus.

SL-5000, SL-5500

SA1110 based, 320x240 display, codename collie

SL-5600, B-500

PXA250 based, 320x240 display, codename poodle

SL-C700

PXA250 based, 640x480 display, codename corgi, clamshell

SL-C750, SL-C760, SL-C860

PXA255 based, 640x480 display, codenames shepherd, husky, boxer, clamshell

SL-6000

PXA255 based, 640x480 display, codename tosa, usb-host, integrated wifi/bluetooth

SL-C1000, SL-C3000, SL-C3100

PXA270 based, 640x480 display, codenames akita, spitz, unknown

Some useful specs (at least for RaphaelWimmer):

Power plug:

Outer diameter: 4.0 mm

Inner diameter: 1.7 mm