I've been thinking about what a handheld computer COULD be.
My image is heavily influenced by my recollection of Palm Pilot.
My needs include:
  >2 hours battery life
  4" by 7" nominal form factor
  touch screen input using a stylus
  display will be entirely character mode (40 chars/line would be OK)
  OS GUI not required except to say where stylus is
  OS shall be Debian {possibly with non-free drivers}
I've not found found user friendly selection guides.
A typical problem was not being able to know if a selection of 
components had mutually compatible I/O (electrical and physical).
A Debian oriented mailing list or USENET group where this would be on 
topic?
TIA