Could you imagine using this for taking notes? Sign up for a free account.
Edit what you see in the left and the text on the right changes.
The reason for this is that this uses the excellent and simple Markdown format to markup notes, so you write plain text and they are automatically presented in a nicer way. For more information about Markdown, see this reference page.
If you had an account, and this was your note, then it would be automatically saved as soon as you can see it on the right hand side.