Last night our sister newsletter The Appside held an event about book-apps in London. The liveblogs should make interesting reading for digital music executives too. Flurry provided its latest data, including the startling stat that for the average app, only 32% of downloaders are still using it a month later. Apps marketing and PR firm Dimoso explained why 10% of an app’s development budget should be set aside for marketing – yet also why quality is the single biggest way to build a hit. Finally a panel of publishers yielded some sales figures and good thoughts on managing development budgets for apps.