I EDC a Sony PRS-505 for pleasure reading. In my EDC bag is an SD card with PDF files of many US Army manuals, Where There Is No Doctor, other medical texts, and a bunch of reference texts. The 505 isn't the best pdf reader, but since I'm carrying it anyway, an extra memory card doesn't cost me much weight and bulk, and it might come in handy sometime. And yes, I also have a AA-powered charger and extra batteries.