Great application ! It's functional and beautiful. As a little experienced developer (still a student), I find you Work in progress page very interesting and f

Great application ! It's functional and beautiful. As a little experienced developer (still a student), I find you Work in progress page very interesting and full of useful tips and information ! Moreover it shows all the work done on this app (especially concerning the UI). You have a lot of concerns about the UI design, do you have any books or online resources concerning application UI that you really like you'd want to share ? Thanks