For the longest time, my sister had been pulling her hair out trying to get her four year old son to recognize the beginning sounds of random things around the house. Although he could tell that a certain letter was in play, he was still not making the connection between the letter and the sound.
Reading the alphabet book was not cutting it since upper case letters had not been introduced (thank God) and things were getting confusing because many pictures did not depict the accurate beginning sounds (although there are a few close calls for the sake of vocabulary enhancement in this document too).
So she did what any amazing mom would do (I have to say she is amazing), and took matters into her own hands. She designed a bunch of flash cards to do just what she wanted.