IRUS is a simple image resizing and uploading utility. It was created to use to resize and upload images on a retail website. I think rather than trying to describe what it does it would be easier to just tell you the process for using it.
First: Download your images from your camera (you don't really have to do this but the application might work faster if you do).
Second: Add some images to the list using the 'Add' Button.
Third: Group the images and name the group.
Fourth: Click the button to Generate and upload the images.