Most of the time a book I own is greyed out in the store so I can't buy it again. this is a good thing. but, it is not a flawless system. I just noticed a book that I own that is NOT greyed out. I have actually bought the same book twice. (You were kind enough to give me a refund). Anyway, it would be nice to mark a book as owned in the store. For example, I own Grace for the Moment but it does not indicate it as such in the store.
Thanks for all you do!