These cards are a great tool for reinforcing the correct order of the alphabet. With the letters "clustered" on the sorting cards, it teaches looking at the alphabet a different way.
I use this activity regularly with my kids with disabilities and it really assists them to learn the correct order of the alphabet in a less overwhelming way than the traditional one-letter-to-a-card activities. They particularly like to time themselves to see how fast they can sort.
This activity is in a variety of lower and upper case fonts.