The best stories of the week from across the web on e-books and self-publishing

1. E-book checkouts from libraries up 200% over 2010 (paidContent)

2. E-book revenues up 153% over last year (paidContent)

3. Amazon announces HTML5 e-book format (Mashable)

4. Big U.S. publishers say e-books now generate 15-20% of their sales, only 1% in Europe (paidContent)