Any site can do that. I can go to your Facebook, MySpace, Photobucket, Imageshack or any other site where you upload a pic and save it to my PC. Just depends on the wording used by the browser.
Opera>right click "Save Image"
Firefox>right click "Save Image As"
IE>right click "Save Picture As"
Chrome>right click "Save Image As"
Safari>right click "Save Image As" and also has "Save Image to My Documents"
Use that on any image that has right clicking options enabled and viola. Image saved to local PC. I could save Naga's Sig and To Do list with just those simple instructions and have them for myself. So yeah any site can do it. There are very few image hosting sites that disable the right click, some even have the save feature right on their page.