This is what one of them looks like, but in real life they have moving parts.
The good thing about this is that Facebook is a good place for the church to be, as it is where a lot of the people are. It will also provide a means by which people can find out about going to their local church via the A Church Near You site, which is a splendid idea (by the way, if your church isn’t on there it is worth adding it if you can).
The slightly not so good thing is that receivers of cards will need to add the application, which they may not wish to do. Adding Facebook applications is of course a bit of a privacy risk as you are giving your information to a third party (the creator of the application) about whom you know nothing. I am of course willing to give the Church of England my information, but not everyone will be.
The result is that not all of the people you send these Christmas cards to will get them, whereas if you send them a wall post or a message they will get them. Of course if you are a real luddite you could send them an actual card made out of card in the style of yesteryear.
If you are making real card cards my 2005 post “One million ideas for making your own Christmas cards” may or may not be of assistance to you.
So in summary, The Church of England Facebook Christmas Card device is a good idea, but if you want to make sure people get the cards send them by another means.
Update: There is a Facebook group for the cards too.