SmartKid - Entertaining Letters is an educational game that allows kids to learn the alphabet and new vocabulary with a series of games. The first thing to do is customize the number of letters you wish to use in the games. For instance, if your kid only knows the A, B and C letters, the games will only include those letters. The games have different difficulty levels depending on your childrens' age and skills.
Some of the games you will find are Pictorial alphabet (the alphabet is shown with images and sounds), Recognizing letters (the kid must select the first letter of the image shown), Fill in the letters (the kid must select the missing letters in the images shown), and Arranging letters (the kid must arrange the letters shown in alphabetical order), among many others. The application is run in fullscreen and it features a lovely colorful user-interface, great sounds, but no music.
In short, if you are looking for a complete and very attractive application to help your kids learn the alphabet and learn new words, SmartKid - Entertaining Letters may be a good choice.