1. My kids love the song "Learning Letter Sounds" by Jack Hartmann. I use these pictures along with the song:
There's also a beautiful YouTube video of the song:
2. You can use ABCMouse for free in your classroom. It's really excellent for pre-k, k, and 1st grade. Your students can read books, do puzzles, play games, and all kinds of very interactive activities. The website will also keep track of each student's progress.
3. I love making and playing games with my students. I especially like this Superhero ABC Bingo game that I made especially for pre-k and kindergarten students. They're my own creation and I did it because I wanted to have a set of interesting, non-violent superheroes that the kids could make up their own stories for. See what you think!
I would LOVE to hear what you do with your kids to teach them their ABCs.