App for tasks with sub-tasks?

[longphant]

Let's say I'm going shopping. My list is as follows:

Before leaving
-pack cooler with ice
-get clothes out of dryer
Go to mall
-manicure
-buy iPad
-return shirts from x
Go to supermarket
-buy salmon
-buy water
-buy eggs
-buy almonds
Go to cousin's
-give present to cousin
-fix his broken phone

What app out there does the following
1) allows tasks ("go to mall") with sub tasks ("manicure")
2) say I want to reorder "go to mall" to the end of the list. I want to drag "go to mall" to the bottom of the list and all sub tasks go with it
3) Mark each sub task as complete as I do them, and that sub task goes away, but the rest of the sub tasks still there

What app out there does this?

 

[chanchan05]

Wunderlist

 

[longphant]

Just installed Wunderlist. It has what I described in the original post, thank you.

How about something like Wunderlist but where we can collapse/expand the subtasks? Wunderlist currently only shows you the top level ones, and you can't see the sub tasks unless you go into each top-level task. I'd like to be able to see my entire to-do list.