It is very convenience. Only one step that you can upload your image and get the various type of URLs so that you can copy them into your web page or forum.
Free cost, free space. It is a very good hosting.
Another, it provide some facilities to make your uploading easier, such as ImageShack Sidebar, ImageShack QuickLoad, ImageShack QuickSend, etc.
OK, try it immediately. That’s funny and great!