Forget formats for the moment. Have you tried trying to find a particular authors work (all in the same place?).
ok ok... so he (in this case - Charles Stross) changes publishers mid-series (as far as I can tell) but I was crying in frustration!
(well very nearly - I would have had I followed the impulse to do 'very bad things' to my LCD monitor).
Hmm the other thing using a mobile phone would be battery issues. How long with the LCD screen 'active' could you read for? On the gripping hand it is rather cool.
(hmmm. need a new phone... hmmm)