I can't say I've noticed any difference in my retention from ebooks vs pbooks - at least, not since the first novelty wore off (during which I spent more time fiddling with the ereader than I did concentrating on my reading).
Regarding some of the earlier discussion: Finding things ebooks is easier when you need do an explicit text search, but I agree with CatLady: in some instances it is easier to search through a pbook. For example I may remember that something was near the front, "near" being one of those subjective terms and will flex according to what you find when you flick back; you glance a paragraph and know it was after that, so you flick forward a few more pages, and so on. That sort of quick scanning through a book isn't feasible with ebooks (or not as they exist now). There is no sense/memory of what "near the front" means with an ebook. In another few generations it is may be that people will forget pbooks and the physical associations that accompany them, but that doesn't deny those associations exist and have some advantages (just as recognising those advantages doesn't mean I don't also recognise the different advantages of ebooks).
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