One of my friends suggested the following two ways of using it:
Go use it, it really is good.
First, it would be a lovely variation on a family Advent calendar. It is aimed at adults, but older children will get the point.
Second, it has specifically been designed to help non-Christians ‘keep the rumour of God alive’ (it becomes gradually more explicit in its evangelistic intentions as days go by). My suggestion is that if, over the next few days, you are emailing work colleagues or others outside the church (or anyone, for that matter), you add it to the foot of the message and invite them to click on the link. (Click on it first to make sure it doesn’t contravene any organisational email protocols – but I can’t imagine it does.)