There is at least two ways to do this, probably more that I have not discovered. The first is to bring up the OF Quick Entry window while in Mail and drag the attachment to the note field. This is the most minimal approach.
What I do most is select the attachment in Mail and bring up the Quick Entry window with the Send to Inbox shortcut. This gives me the email title as the task, but the entire entry is selected so I can type a new task name to replace it. Also the sender info and a link to the email is included in the note, along with the attachment.
