Many free image hosts such as imageshack,imagevenue and imagebam serve free image hosting, but these image hosts do not give direct links to stored images and if you plans to save an entire gallery of images that are hosted on these image hosts you can use this firefox addons called ImageHost Grabber

ImageHost Grabber (IHG) is a powerful utility that makes the task of downloading these galleries a simple task. You can think of it as IHG doing all the work of “open new link, right-click, save-as”.