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In the past two weeks Sony have added about 1100 new titles (a 2.1% increase) and now have about 53,742 ebooks for sale for the Readers (the sum of books in all categories which includes roughly 3500 double-counts). They have added an average of 91 new ebooks per day to their store since Sept., 2007. The greatest percentage increases in the past two weeks are in the categories of Travel (up 7.9%) and Technology (up 7.1%).
In the same period Amazon have added 5800 new titles (a 3.1% increase) and now have about 190,481 ebooks for sale for the Kindle with an average of 299 new ebooks per day added to their offerings since November.
Below is a plot of the total number of ebooks available from these two vendors since I began tracking them in September of last year.
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