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I'm not sure what the Guardian mean by a dedicated boys' bookshelf in the library.
I would think libraries would start classifying books using video store categories: comedy, adventure, drama, science fiction, etc. if they want to be user friendly. Kids also prefer choosing paperbacks from those spinning racks over hardcovers stuck on shelves. You really can't knock any effort encouraging leisure reading in kids but nothing beats a librarian taking an interest in you and matching your interests to a book with a manageable vocabulary for your reading level.