Thanks a lot I also just looked into the kindle app for the iPhone although I asked for solutions to side step that and it is actually pretty good with a huge selection
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My friend uses Kobo, which also seems to be available for BlackBerry. I tried it out myself and the selection of books seems great, but maybe you know better what suits you so why not try it out?
Barnes&Noble's store is available for BB and iPhones, as well as their ebook reader (Nook). I dl the BB app once but I didn't look at the selection (they dl a couple of freebies). They do go onto the SD card so they don't clog your memory on the BB.