The Data Liberation Front is an engineering team at Google whose singular goal is to make it easier for users to move their data in and out of Google products. We do this because we believe that you should be able to export any data that you create in (or import into) a product. We help and consult other engineering teams within Google on how to "liberate" their products.
Great things are happening at Google! This is another fine example of how they are practicing "Not being evil" by making it easy to control and manage your data.