So I got a Kindle Fire

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I like to read. I have books every where, living room kitchen, rather extensive collection in the bathroom. I like to reread books and sometimes I cant find the book I want to reread. So an ereader is pretty much a no brainer, all my books from here on out in one place.

Now what are the good useful apps for the Fire? Im going to root this thing soon to get the Android Market on it, and maybe eventually just install Ice Cream Sandwich on it. For now I would like to know what are useful apps for a stock unrooted Kindle Fire?