Bright child can't retain letter names?

Again like one of the other posters - I'd highly recommend the Leap Frog DVD's - it's a movie, lot's of music - very catchy. My 4 1/2 year old knew few of his letters prior to getting this DVD. I started with the "Letter Factory" then "the talking word factory". You basically work your way up. My little guy has exposure issues, attention span issues and I figured this was a good way to jump start kindergarten. Good luck!