The bookseller has released new versions of its ereading apps for Apple mobile devices and PCs, now unified under the Nook brand (as previously covered). The iPad version of their app now lets readers “rate” the books they’ve read, and the line of apps promise much more customization of fonts, colors and other aspects of the screen appearance.Release In the UK, WH Smith has taken the lead in ebook pricing wars, offering all ebooks at half the publishers’ digital list price.