1) Adobe AIR allows developers to build multi-screen mobile applications using Flash/Flex that can be exported to iOS, Android, BlackBerry and other platforms. 2) Developers need Flash Builder 4.5 to build Flex/ActionScript mobile apps, which supports detecting device capabilities like touch, orientation and cameras. 3) The document provides an overview of tools needed and considerations for optimizing AIR mobile apps, such as using bitmaps over vectors and managing frame rate and memory.