Has anybody here using Meteor for something serious? I am aware that tmeasday is writing a book about it here http://themeteorbook.com/ and it was discussed on HN http://news.ycombinator.com/item?id=5179828, but would like to know if Meteor is being used for something real at the moment.

There is also Derby, which I am also looking into.

I am starting a new real-time project, and I need to decide what framework to use :)