Gizmodo says that for every hundred print books Amazon sells, they now sell 105 Kindle books.

That said, March sales figures show print book sales increasing for the first time in months. Hardcover sales increased by 6%, according to Galleycat. Mass market paperback sales increased by 1.2%, too, though paperback sales in general declined by 7.7%. I don't think we've reached the bottom of the print book downturn by any means, but I do think it could be the beginning of an evening-out period that might last through next Christmas.