2Do Tasks is a very simple but effective personal organizer app, which offers great synchronization support across Dropbox, iCal, and iCloud. The app uses Siri to add reminders, offers tabbed calendars, projects, check-lists and to-do lists, and secures your content via password protection. There’s also the opportunity to drag-and-drop tasks into folders, repeat to-do actions and schedule tasks for days or weeks in advance.
The app is location aware, supports voice notes and Apple’s Retina display, and can back-up and restore data. You can also export to-do lists to view as an email or in a CSV file format, or to share these via Twitter or SMS.