People love their iPhone apps -- after all, Apple has sold over a billion of them since it launched the phone. And a big proportion of those apps are games. But you know what else a growing number of people love to have on their iPhone? Books. According to Mobclix, which does mobile advertising for apps, the number of books in the iTunes store now exceeds the number of games for the first time since the device was launched, making books the largest category in the store. The numbers from Mobclix, which keeps a regular tally on the most popular apps and downloads, show that there are more than 26,000 books in iTunes, compared with a little over 24,000 games.