I have 513 books on my Kindle DX and finding anything is not a problem. I normally do a search with title or authors name at the bottom of the home page. If I want to go to a certain page, I just type in the page number and click the five way button.
As for bookmarks, I very seldom use them on my Kindle as it is good about keeping my last page read and I am the only one using it for reading. I share my Sony 505 with my husband for Overdrive Library books and on it we both use bookmarks frequently.
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