Scratch is a free website to download. It is a new programming language that makes it easy to create your own interactive stories, animations, music and art and share your creations on the web.
"Scratch is designed to help young people (ages 8 and up) develop 21st century learning skills. As they create and share Scratch projects, young people learn important mathematical and computational ideas, while also learning to think creatively, reason systematically, and work collaboratively".
It seems to be a very good innovation with which you can have a lot of fun and let your imagination being creative. But it is really hard and complex to understand and use, especially for kids for who it has been designed. I had a try and was unable to understand properly how to use it.
In my opinion, Scratch is not an useful innovation to work on within a classroom as it is to complex and time consuming. It can be use for example in a computer free time lesson to let the students explore and familiarize with the website, to then spend more time on it at home if they find it interesting.