Flawless synchronization with BusyCal, iPad and iPhone. I use it instead of Apples Reminders because drag and drop sorting is ridiculous. Id give it five stars if I could create subtasks. Doesnt need a desktop version if you have BusyCal - you can organize, edit, and sort right from within BusyCal. Now back to that subtask issue.......
FrankDB about BusyToDo