How to Make or Repair Accessories for a PDA or Handheld PC

Links to selfmade accessories suitable for a PDA or HandHeld PC. If you have written a do-it-yourself report yourself (or if you know of a report not linked here), please submit a new entry.

Agenda VR3 [external link] Turning the Ericsson Chatboard (a SMS keyboard for some ericsson mobiles) into a keyboard for the VR3 PDA.
HP/COMPAQ iPAQ [external link] How to build a car adaptor (schemactics, pictures, tutorial).
SHARP SL-5000D (aka Zaurus) [external link] Selfmade speaker project.