The old Delightful Reading kit is the same as the new Delightful Reading, Level 3: From Words to Books. In the old kit, the teacher book had a section in the beginning that described teaching the letters and the sounds, and some word building. We had many moms ask for more instruction on how to teach the letters and sounds and how to do word building, so we created the other two levels.
The only differences in the new Level 3 from the old kit are that the old kit uses small letter and word tiles, while the new kit has cards, slightly smaller than standard playing cards, and we changed the pictures on the box and book covers. The teacher book is the same, with the descriptions of teaching the letters, sounds, and beginning word building removed, of course. The A Delightful Reader and My Word Book are the same.