Today, with the holiday shopping season nearing, the Google posted a "tablet app quality checklist" highlighting best practices for building for the Nexus 7, the Samsung Galaxy Tab, and their peers. It's all aimed at developers, particularly those who may have previously only developed for Android phones. ("Take advantage of extra screen area available on tablets," one of the more obvious suggestions goes.) A checklist isn't going to build a platform, of course. But alongside the post today Google also shared what amounts to a sales pitch: "developer stories" that help Google make its case that software makers should build tablet apps. In its post, Google makes three points: Bigger screens lead to more engaged users. More engaged users make money for developers, either by purchasing goods inside the app or by having their eyeballs sold to advertisers. It's easier to retain users on tablet apps. Game maker TinyCo. told Google that players of its games are more likely to return than users of smartphone apps. As a result, they are able to generate more revenue per user over time. Android tablet sales are increasing, and users are following. In a savvy move, Google highlights Instapaper -- an app that was long a darling of the iPad set, and moved to Android earlier this year when original developer Marco Arment hired Mobelux to port it.