For what it's worth, I do most of my reading on an ipod touch.. I've powered through most of my stephen king collection that way, and moved on. so reading a whole novle like that is nothing new to me

Though I will say, in ibooks at least, you do need to remember that there's no way to zoom in for more detail, you're stuck with a single static unresizeable image. This has made some books annoying because they they have actual maps in them and referring to them as you go would certainly help - but not when they're so small you' can't make anything out besides the overal shape.

I would use an ipad for reading (the wife loves hers, but i can't afford 2 right now), but when it comes to text, i can read on the pod quite well. but for maps I need to move to the computer.