Has anybody ever used anything on their iphone or mobile device to keep track of their film inventories? I use the note app for my iPhone, but there should be a better way. When I'm out and see a good deal on film, it's nice to see if I actually need that particular film. I shoot so many different film types, and it is easy to forget what I have. Doesn't look like there is a dedicated film inventory app, but wonder if anyone has converted a checklist app to use for film.