Congratulations James & Henri! I'm very happy that my lab has been financially contributing to your work for nearly a year :-)
Anyway, I'm currently writing my thesis and I've had to stop using your product. The dropbox sync is lame (I know that the problem is on their side) and working on three different computers (usually two at the same time) is a problem. But in case of collective writing, then shareLaTeX is the most useful tool. Thank you for that and for your move!