I don't see the need to delete a book in memory from the 500/505 not hooked up to a computer. In fact, it just adds bloat. I'll tell you why.
You have your 505 with you, you finish a book, if you were able to delete it, you'd go and delete it. Yes, you've just freed up memory. But so what? You cannot use the memory for a different book because to do that you'd need it hooked up to a computer and when you go to change the contents of the 505, you'd need a computer anyway. So why not just wait till you get to that computer to delete your content? See, it add no functionality at all in the real world.
The Kindle has it because you can change content without being connected to a computer. So please don't ask for really useless features.
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