The Elder Scrolls V: Skyrim Glitches

How to Duplicate a Book
First you need to buy a house, or at least find some place with a bookshelf. Kneel in front of said bookshelf, and select the left corner inside of it. Store your book, and exit. Now quickly select to bookshelf before the book appears, and take the book back. Exit, and quickly select the book before it disappears, and take it. You should now have two of your book.

Note: This glitch works with the Oghma Infinium, but do not use it's power with two in your inventory, or else it will get rid of both.