Unite for Literacy is a great website I discovered through Mattbgomz. The site features over 100 audio books for early readers. You can use these materials with your kids to help them improve their reading skills. These books can also be played on iPad so you can access them on the go.
The audio books offered by Unite for Literacy are all free and you can use them right off the website. There is nothing to download and no registration is required. You can also choose the narration language you want. There are over 30 narration languages to choose from. I have tried both French and English and found the narration language quite accurate.
Unite for Literacy also provides a feature called Reading Community which allows you to set a reading community for your kids based on your geographic location. I am not sure whether this is a good feature you want to use or not by you can give it a try and see if you like it.