Your flight is delayed and you're stuck in the terminal for who knows how long. So grab a Cinnabon, break out the iPad and do a little mind-mapping with CMS's iThoughtsHD, an $11 app for organizing ideas, information and random thoughts. Dozens of icons, clipart images and background patterns help you organize your thoughts visually; you can drag and drop associations between topics. The Doodle feature is great for freeform drawing too. The iPad's Retina display (3rd- and 4th-generation) is particularly well-suited to iThoughtsHD's visually-oriented brainstorming.