Good Gear Guide
In Pictures: 25 essential business apps for iPhone...
This is a task-management app that makes the old To-Do list look like something developed by precocious chimpanzees. With Wunderlist you start getting organized simply by creating lists of tasks that you need to get done. Then, Wunderlist helps you complete those tasks by helping you fill out, in an organized fashion, the steps you need to complete to accomplish each task. The app lets you keep track of your more important tasks with reminders and notifications. You can create a new task for Wunderlist straight from your email inbox, and the app has built-in collaboration and security features.
Available on Android too? Yes
In Pictures: 25 essential business apps for iPhone 5