If you regularly come upon website images that you want to transfer to image hosting websites then you might want to try out the Image Transloader extension for the Mozilla Firefox web browser. This could be helpful to create backup or mirror copies of selected website’s images but also to display the images that were uploaded to image hosting websites on other websites to prevent bandwidth leeching from the original poster.
The Firefox add-on supports the two image hosting websites Imageshack.us and Phyrefile.com. It will add a “transload to..” entry to the right-click context menu of the Firefox browser if the right-click occurs on an image on a website. All that it takes to transfer a website image to the image hosting website is to right-click the image and select the transload entry. The Firefox add-on will automatically copy code that links to the image to the clipboard making it very easy to paste the code into other websites.
The options of the add-on contain the means to change the image host but also to define the type of link that gets transferred to the clipboard automatically. The choices range from BBCode for forum postings over webpage links to direct ones.

Image Transloader is currently an experimental Firefox add-on which means that it is required to log in the Mozilla website before it is possible to download and install it. It works well to transfer website images to image hosting sites but has a few problems with images that are displayed making use of JavaScript especially those that are shown in front of the website because of the script.

Batch Download Images From Image Hosting Sites
Display Full Images That Are Posted As Links Or Thumbnails
Firefox Batch Image Downloader
Firefox Image Navigator
Firefox And Thunderbird Image Zooming
Block Websites From Appearing In Firefox History
http://www.1pixelhost.com is probably nicest image hosting website around. Imageshack was too slow for me with too many ads.