Many websites post random images every time their page is reloaded, webcams come to my mind as well that load a new image once every few minutes. Saving a sequence of images is really painful if you do it manually. You have to click reload, save the image, reload, save the image. SeqDownload is a nice little freeware application that automates this task for you, download the program from the link above and unpack it into a directory of your choice - there is no installation involved, run it right fom the location you unpacked the files to.
