This was quite easy to do with the magic wand tool, although I had to fix some bits where the white stripes on the object blend with the background with the lasso tool. The next step is to select the background. (You can use this technique with a gray or colored background too, but it's a bit trickier to get good results that way.) In this case, the image is already nicely adjusted, so we don't have to do anything about that. In general, the first step would be to adjust the levels of the image until the background really is solid white, except for the shadows and reflections we want to keep. For example, let's say you have a photo shot in a lightbox, such as this nice and freely licensed picture of a Swedish wooden toy horse courtesy of Creative Tools: To expand on utopicam's answer, sometimes your image might contain areas, such as shadows, that you'd want to be semitransparent. In newer versions color to alpha doesn't exist
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