Since I didn't know this and it is a fairly popular support topic, I wanted to post a quick and easy method for importing pictures from Mail.app into iPhoto.
How To: Import pictures from Mail.app to iPhoto
- Open an email with photo attachments in Mail.app
- Click and hold the "Save" icon in the message header
- Select "Add to iPhoto to add the attached messages to iPhoto.
Pretty easy, huh? Yeah, I was kicking myself, too. 🙂