I have a lot on my Palm PDA (Sony TH55E). Almost every useful material which I've found on this forum is in there, plus many more. They are mostly in PDF format, some in JPEG images, several in MS Word .doc format, and some in a plain text. Video is too space consuming but it's also records and plays Ok (for the proof of something, for example) with this PDA.

Plus, I've acquired many palm software titles over the years, which are in fact are the interactive documents. They are ranging from the simple knots reference chart and subway guide - to the several languages vocabularies and 3 different GPS navigation applications with the integrated map database covering about 1000 mile radius from my home location. Everything is on the 2 trans-flash memory cards - 4 GB total (+1 backup stick of 2GB).

Regarding the power for my PDA. No problems at all - it's not a fridge. It holds the charge for 10-14 hours of reading (that's sufficient for about a week of intensive use). However I have a power kit right on my person almost all the time (in the pockets of my ScotteVest).



It consists of 3 components:

• one is a bit smaller than a cigarette pack with a bunch of different connectors and adapters, standardizing all of my everyday devices (actually much more than that) to a single mini stereo audio phones male connector, piece of electrical wire, piece of nichrome wire (to improvise a particular ohmmage resistor), high voltage rectifier, several voltage regulator IC's (step-up and step-down) with schematics, variable resistor, screw terminal, gold plated neodymium magnets, mini voltmeter, and a single AA cell 5V charger (bottom of the image);
• another component size is like a 1/8" thick stack of postcards. It contains 7 sheets of solar film panels producing 200mA at 7V each (may be configured for producing a different voltage and current), and a piece of aluminum foil (not shown because they are a part of another, sealed for now, pocket kit);
• the last component is the 4 AA USB charger. It's slightly wider than a cigarette pack, and equipped with 4 Eneloop rechargeable AA's. It allows to charge them from any 5V source and to discharge them at its regulated 5V output port. Usually, it gives at least 4 charges for my PDA with the freshly charged Eneloops (shown at the top of the image).
• oh yes, I forgot about the 4-th component - AC and Car options, it's ScotteVest, you know :
  
  The smallest I could find. However while shopping make sure the AC adapter can provide enough current to power your device. As a rule of thumb - the 500 mA is the minimum for the most of a nowadays electronics.

As you can see I can rig a charger for my palm PDA, phone, radio, flashlight, etc... to use almost ANY source of electrical power, and in many different ways. Once I've charged my PDA to 50% from 14 soup plates with salted water (galvanic cells). Another time I've got enough juice to trigger the "charging" indicator using a Wimshurst machine (electrostatics). I'm using this kit on a daily basis (primarily charging from an available USB ports though).

I don't believe in high probability of damage from EMP, but I do have an aluminum case for my PDA (the PDA is not in it all the time though).