I keep unread books, unloaned-but-lendable books, and books I think I might want to reread on my device. I archive books I doubt I'll read again (and, if lendable, I only archive them once they've already been lent--I participate in lending sites and like to have my lendable books unarchived because they're easier to lend that way). I never know what I'm going to be in the mood to read so I like to have everything handy.
I use the "shelves" on my nook and one of the shelves is "unread." Another is "borrowed." My other shelves are genres.
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