1. Digital storytelling and computer-based math go hand in hand. I think one of the greatest benefits, other than the visual nature, is how personalized the material can be. Digital storytelling is based on the speaker, who controls the story. Rather than teaching from a textbook, the teacher can make the math relatable to students in any way she chooses. Plus, she has the opportunity to make things engaging, perhaps by adding in familiar names or places that will get children excited about the problem. Additionally, the medium of storytelling varies slightly (as it can be a Prezi, a youtube clip, etc.) so the children won't get bored of the same thing.
2. Here's one good example I found of math digital storytelling. It's about a boy who needs to buy a new bike, and wants to know how many weeks of pay he'll need to save up. The problem is something the children can understand easily, and has a strong foundation in real, everyday math.
3. Here's my math video. I made it using Windows Live Movie Maker, and then posted it to youtube.