Treedolist.com — 'This is a hierarchical organiser for tasks, notes, lists, weblinks and RSS feeds'

From the website:

What is Treedolist?

You can store tasks, lists, weblinks, notes, RSS feeds and more.

You can manipulate your tree in a simple, intuitive interface with drag-and-drop or keyboard shortcuts.

You can categorise items in your tree by due date or urgency.

You can share single items or whole branches of your tree with your friends.

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TechnoDolts™ will please move on, nothing to see here.

Everyone else, have fun.

Why does the diagram up top remind me of of the one below?

Must be the color scheme.