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The beta version of the Mobipocket app for Blackberry's Storm2 has been annoying me recently because, under some conditions, when I re-open the application I find that it has opened my book to a location a few pages back from where I left off reading.

This led me to think of how things used to be years ago when I still read paper books. I never used bookmarks because it was a hassle to either move the bookmark once or twice every time I flipped the page, or else remember without fail to insert the bookmark before closing the book. I just had a sense of the thickness of remaining pages and opened up close to where I left off and flipped around a few pages.

However, nowadays, I've usually got between five to ten books in progress at once (on Blackberry and Sony Reader) and there is no way I could possibly remember where I was in so many books at the same time. I would be completely lost without the automatic "resume from where you left off" feature.

So for you guys who still read paper books, do you use bookmarks? How many books do you have active at once?