picMarkr let you watermarks any selected flickr pic or any image that you upload from your desktop to flickr, it help you to protect your work from others who steal your best work and won’t give you credit. You need to authorize the app with Flickr, and thereafter you can do it easily through Flickr sets by selecting pics to watermark and choosing from different watermakring categories. This is something new idea like photo editing in flickr, I hope these app would be integrated to other photo sharing site too and quite helpful to webmaster those usually looking for watermarking images.