I bought an iPhone 4 about six weeks ago.
My second phone in about 15 months was about ready to die, as the previous one had.
I decided I needed a more reliable phone.
I mostly need a phone to be a phone; a way to be contacted reliably.
We have five children. That's enough reason, huh?
Of course as soon as I had my phone I downloaded all kinds of reader apps.
I am not more impressed by any one particular app than others. They all pretty much do the same thing; allow you to read books on the screen of your phone.
I read parts of Bill Bryson's "At Home" on my phone last month. I knew I could do that so I purposely left home without my NOOK once in a while so I would have to use my phone to read.
I found that I really do not enjoy reading on my phone.
It's just too small.
I also found that the lighted screen appears to be much harder on my eyes than the eInk screen of my original NOOK.
I am certainly glad that my phone can be used in that capacity.
I won't be switching to my phone for reading though. I'll only use it when it becomes necessary to do so.