Have you ever wanted to add a note or to-do to an e-mail someone sent you? In the new OSX leopard you can. All you have to do is open the e-mail you want to add the note/ to-do to and "CTRL + Click" anywhere on the message and pick New To-Do from the drop down menu. This add an area just above the e-mail that will let you type in your notation. The item will be saved with the e-mail and also in the To-Do section of mail.