Adobe has come out with Adobe Photoshop Express photo editing tool for iPad and it is free! First I want to tell you that this is not a full blown Photoshop you might have used on your computer but if you just want to do basic stuff to your photos like crop, straighten, rotate, flip, frame then this app is for you. Go get this app and play around with it. I still find new features after using it for a few weeks. This is a great app for editing photos before emailing them out to friends on an iPad.
Check out the video below. It's video review done by adoramaTV and it will go through what this app can do.