I second this. I have well over 7k photos on my phone (& microSD card) which serve as a diary of sorts. E.g. whenever a new restaurant opens I take a photo as a reminder to add it to OpenStreetMap.<p>My tip is to find out if your phone supports calling camera with a double press of the power button and using volume button as a trigger. You can fast-draw a camera when something happens in under 2 seconds.