Thanks to Leopard, Mail boasts amazing new superpowers. One of the best: the ability to create and manage to-do lists as easily as writing an email.
In fact, you can create a to-do item directly from an email. Simply Control-click (or right-click if you have a two-button mouse) anywhere in the background of the email, and then click the New To Do button that appears.
A yellow field appears at the top of the email. Here you can enter a name for the to-do item, or click the red arrow to set a due date, assign a priority level, or enter the note on a particular calendar.
The item now appears in the to-do list in Mail’s Sidebar. (If you can’t see it, click the triangle next to the word REMINDERS to reveal it.)
Another slick trick: If you select any text from the email before you Control-click to reveal the New To Do button, the selected text becomes the name of the new item. Here we highlighted the book title in the email, then Control-clicked to create a new to-do item.