PhotoMarkr lets you add your personal watermark to your iPhone and iPod touch photos and screenshots. This is a great tool for all photographers who like posting their work online. Just set it up once, and then apply your watermark to any photo with the click of a button. This app is temporarily free and you can download it here.   Features   – Create a watermark from text, or import a custom watermark as an image – Position watermark anywhere on your photo – Move, rotate and resize your watermark – Change watermark transparency   PhotoMarkr always saves a full-res original, and a full-res copy of your photo with…