For quick intro : check out getfastminder.com

Fastminder is a slick todo list, with slick gestures AS WELL AS Reminders! Slide left to delete, slide right to add. And a lot more gestures like that, to make your life easy.
Reminders are synced as calendar events, so you can see things in calendars.
You can have multiple lists and things like that! Moving items within the lists or to another list is so easy and fast.

With each todo list item, you have an option to make it a reminder. Just tap the clock button, then either slide the clock or type the date. Simple as that.

When you tap the clock button, you can add dates in natural language, or just slide the clock and it will adjust the time for you. Very simple, easy, quick and natural. Or, just type the time if you just want to change the event time.

"Dinner with joe 9pm" or "Susie's wedding august 15th 9pm" works.
Best of all, with some devices you can just dictate the event details.
The natural language processing works on your phone, not some servers somewhere.

Events are synced to the native iOS calendar system, so it can sync with gmail, outlook or
exchange. You can use the native calendar app or any other ones to view the events
you made.

You can save and send your list to others!

★ ★ ★ Features ★ ★ ★

Multiple-list Todo list
Gesture Based operation, slide things everywhere!
Reminders that sync as calendar events
Multiple alerts per reminder, like calendar events
Lists can have subheaders, to organize and collapse things
You can move items or subheaders (and its contents) to other lists
Passlock support - lock some lists, but not intrusive when viewing unlocked lists
Search your lists in style!
Various misc functionalities in the lists menu, like roullette etc.

★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★

For in-app support, slide the screen to the left, and go to settings -> support.