I've been researching tablets a lot thinking that when my JBL goes that is the way I will go next time the only drawbacks are battery related almost all tablets only have 5 hour usage rate and I've only seen one or two that have (designed
replaceable batteries
I saw something like
http://www.gomadic.com/battery-backup-cat.html a way to harness 4 batteries that ended in a mini usb plug that would let you continue your tablets use in an emergancy ..like if the tablet died while I was using it as a gps and stranding me in an unknown city...
A 5 or 7 inch tablet would make a good reader plus the fun stuff for a gadget freak
like me
coolereader has changeable colors for fonts and backgrounds and up to a 72 font so that would work for me