One of the new features in Mac OS X Leopard Mail is the ability to add bulleted and numbered lists in your messages. Note: You must be using RICH text and not Plain Text to create them. It will prompt you if you are in the wrong mode.
Here's how to do it:
1. Open MAIL 2. Click on NEW MESSAGE 3. When you are ready to insert your list, go to the FORMAT menu and choose 'LISTS' and select either Bulleted or Numbered. After entering each item, press Enter, and after you have added your last item, press Enter twice and the list will end.