Just make sure if you're using an ipod touch as an ebook reader that you turn off wifi, you dont want to unnecessarily drain the battery.
I have to say, on the subject of iphone as ebook reader, it's ok but not great. A big part of that is the battery life; do too much on an iPhone in general and you'll run the battery down inside of a day. (I learned this the hard way at a rugby tournament-I took a teammate to the ER and couldn't read on my iPhone while she was in x-ray because the battery was so low it was either send/receive calls on her condition or read. Needless to say, I chose being able to update everyone.) Lesson there is don't depend on any "all purpose" device to to get you anything spectacular as far as usage goes.
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