Look for this feature (or ask) for the readers you look at.
I would like an ereader that I can store contact information on in whatever format it takes although I would prefer pdf.
I need an ereader that requires some type of authentication for access. Does such a beastie exist?
I'll expand my requirements a bit. I probably should have done this at the start.
Lightweight. I want to carry this in a backpack while I ride.
Cheaper than an IPad. Because there is every chance that I'll break it tossing the bag around.
I don't require all the IPad functionality and would prefer not to pay for it.
Enough memory on board (not a card for security unless it is encrypted) for about 100 pdf documents at screen resolution.
Hoarding photos on your phone?
Those picture are hogging memory and could be slowing down your phone.