My little monkey, A3, sure is crazy about learning letters! Maybe it's because he has these fun iPad games to play with...
1 Starfall ABCs
This app isn't as flashy as the Elmo app I will describe in a moment, but it's usually A3's top pick. The gumballs for "G" seem to be his favorites.
More than just letter sounds, the game introduces other concepts like "on and off" for the letter "o."
Distinguishing one letter from another is a skill tested during this game, where he sorts "o" and "n."
2 Elmo Loves ABCs
Full of videos, activities and coloring sheets for each letter plus several versions of the alphabet song, this app is beefy and comprehensive. I think they took clips from a gazillion Sesame Street episodes and organized them into this colorful game for iPad.
3 All About Reading's Letter Sounds App
This one I don't have yet, but it's free so I'll download it today. I just got an email about it from All About Learning; this free app will take the place of the Letter Sounds A to Z CD ROM that is currently part of the All About Reading Pre-Reading program (affiliate link).