There is nothing sweeter than the voice of your students sharing their enthusiasm for a good book! Okay, perhaps on occasion their voices aren't completely sweet...but I love capturing that moment in time as they develop as readers. Two apps that I've used for book reviews and other audio projects are Storykit and Croak.it. I've written about Storykit before because it is a very easy app that can support many different projects. You can read more here. You can record up to 1 minute per button on a Storykit post (see to the right), but you can have several audio buttons on one page if your students need more than one minute. As you can see, you can also include images on your Storykit pages and my student here created a movie poster for his book with the Pic Collage app and then used that image in Storykit.
Croak.it is simply an audio app. It allows for only 30 seconds of recording, but it is so easy to use that it works great in Pre-K or Kindergarten. I love the idea of using a QR code taped to the book or as an interactive bookmark so that students can hear reviews on their iPads as they rummage through their classroom library. Read more about QR codes here. Or read Jason Fleming's blog post here.