I have a kindergartener and a second grader. For this age - sight words are very important. There are two apps that we use often. I highly recommend these apps.
Word Bingo by ABCya.com ($0.99) - This uses predetermined sets from the Dolce word list. There are 300 words split into the following categories. Pre-Primer, Primer, First Grade, Second Grade, Third Grade, and nouns. You can also choose all words. There are four games included - Word Bingo, Spelling Practice, Word Fling and Word it Up. My daughter loves Word Fling the best - I am a big fan of Word it Up. Note that you must play word bingo before you can select Word Fling or Word it Up.
Positive - the games are actually fun..... Also, you can program in a student name and track the progress. You can go into the word lists and see what words they are getting right how often.
Negative - you can not customize the lists
you can read more about it at
http://itunes.apple.com/us/app/word-bingo/id406264088?mt=8
Sight Words by Phototouch - free - This ap is a flashcard type app that drills on sight words. It is actually pretty cool in that you can either use their predetermined list - or you can add or delete from their list. They have 5 lists - preschool, kindergarten, first, second and third. You can set which lists you want turned on for the quizzing. You can also use the recording of the word that it came with - or you can rerecord it so it is in your voice.
The "game" itself will show three different words on the page and then a voice will say the word. The child should then select the word that was just read. If right - "fantastic" and next slide appears. If wrong the ipad beeps and gives the child another chance. It will continue to beep until correct word is chosen. Also - you can select the minimum and maximum number of words to show. You can even set the min and max to 1 - which would be a good review.
If you set the min at 3 and the max at 10 (for example) - the app will level up and down accordingly. So, for instance if you have three words shown and you get three right in a row - it will start to show you four words at a time. Also, if you are getting the answer wrong on the first attempt two times then it will decrease the number of words shown.
Negative: This is just meant for one person and there are no reports on how they are doing - or tracking to let them start at a certain level. Also - the game can get monotonous.
That being said - it's free and you can put it your own lists - sounds like a keeper : )
you can read more about it at
http://itunes.apple.com/us/app/sight-words-by-photo-touch/id421341850?mt=8
Hope you enjoyed those reviews - I'll have more soon!
Big Sounds by Dragosaurus ($0.99) - This app contains 117 different sound effects! There are all sorts of animals, cartoon sounds, everyday sounds and much more. I also really liked how you could turn off certain sounds! I really liked a lot of the sounds - but there were some that I would rather my children not use! You can also rearrange the buttons on the app so that all the sounds that you want are in one section. 
Audio Memos by Imesart ($0.99) - or free. There is a free version of this app that has limited features which is probably adequate for most needs. This app is a very simple audio recorded. I have used this to record my son playing the piano or reading. It's nice to play back and have him listen to himself. 
