I love this picmonkey editing progam they have here at Ipernity! One of my most annoying problems is not keeping my horizon line straight, so it's not uncommon for my images to feature telephone poles or building edges that are tilted. This picmonkey has a lovely feature when you choose rotate called "straighten" that gives you this handy grid and a control to straighten out your image. It even automatically crops it for you when it is properly aligned. Love this to bits!!