Thanks for reminding me about Where there is No Doctor.

I'm using an iPod Touch, and have an application to and read various files such as PDFs, applications for offline storage of Wikipedia, applications for offline maps (topographical and street), dictionary, and book readers where I can download public domain and Kindle books.

My setup can be seen in this post, although I do carry a few additional issues like spare cable, and a external battery pack that takes AA batteries, but again, supplies USB charging capability. The main optimization is that I only need one cable.

I have been keeping reference manuals for gear I carry, personal information (in an encrypted notes application), and a number of medical related (Kindle) books such as:

First Aid: A Pocket Guide
Taber's Cyclopedic Medical Dictionary
Medicine For Mountaineering
Mountaineering First Aid
Illustrated First Aid Guide
98.6 Degrees
Current Medical Diagnosis
Dog Owner's Home Veterinary Handbook

You get the idea.

Being able to have PDFs and self prepared stuff has been great, but I'm *really* happy with the ability to get commercial books now as well.

-john