Sync tasks over-the-air on multiple devices running 2Do (including iOS) using Dropbox or Toodledo. Dropbox sync supports syncing all data, including Smart Lists, across Android, iOS and OS X devices.
Projects, Checklists or a simple Todo list
Repeating ToDos with end dates
Tabbed Calendars / Folders for easy organization and grouping
Password Protection: Lock all your tasks or individually picked Calendars
Drag & Drop tasks from and to Calendars
Smart Calendars: Dynamic lists based on saved searches with an optional dynamic date range
Alarms: Easily create multiple alarms per task
Flexible task manager: Use GTD (Getting Things Done) principals, Franklin Covey or your very own