I was looking up some photo field calcs and thought why use a cheat sheet if there is an app for this, I forget that there is a computer in my pocket at times. So what are your favorite photo apps? How well do they work for 4/3, or do you have to adapt them? Free or paid app? For me, I use Flickr, PS Mobile, and Camera bag. None are super powerful, but they are fun to play with. Rob I also use Darkness for tracking the sun and moon, works great for planning early riser activities as well.