Amazon vs Kobo: How Much to Make the Ebook Switch?

Amazon has been locked in an epic battle with publishers for control of ebook prices for years now, and the fight has lately taken a nasty turn. Among other things, the retail giant has recently banned pre-orders of Hachette titles, including JK Rowling's next mystery novel, and today it appears that it's done the same to Warner Bros movies, refusing to take pre-orders of The Lego Movie.

This is obviously irritating for publishers - and authors, as Stephen Colbert's amusingly rage-filled reaction highlights - and it has implications for readers too