There's the Pocket Linux Workstation at:
    http://mylinux.sourceforge.net/
    http://www.azpower.com/mylinux/

They're trying to get enough orders to build a first production run. For
US$699 (or less, depending on the size of the prod. run) you'd get:

Custom SuperH 7709A-166MHz, 128MB SDRAM, 64MB Flash, 240x320 TFT LCD
Display, 8bpp, Touch Screen, USB, IrDA, Compact Flash, 2 PCMCIA Slots,
Serial Port, Serial Cable, Developer Port, Audio Sound, Mono Speaker,
Rechargeable Battery, Power Adapter (Hardware), CDROM Linux Software
Distribution, Electronic Documentation (Software), Early Adopter/Wide
Beta Program T-Shirt.

--yanni

Stephen Pair wrote:
[snip]
> Does anyone know of such a device?  Seems like it could be a huge
> market.  Current PDAs are too limited in terms of storage capacity and
> it's a pain to keep them in sync.  The current devices only have about
> 12MB of DRAM, but I would imagine you could build something with 256MB
> of DRAM or more and still keep it small.
> 
> - Stephen