This morning, Amazon released a small update to its Android app, including voice search and a Wikipedia dictionary. Hidden in the release was another interesting stat—the U.S. Kindle Store now has over 700,000 books. This is up from 670,000 books three weeks ago.
It seems like Amazon is adding books to the Kindle store at a steady pace; As of the end of April, the store had 500,000 titles. The U.K. store only has 400,000 titles, as of our last report. Barnes and Noble claims to have 1 million titles for purchase.