I'm afraid I don't know anything about this—like who put it together, which would be nice to acknowledge—but it's a very nice visual representation of the relative size of many of the current leading small cameras. If you click on the image, you'll get a larger version with the hairline guides.
I've been working lately (and seemingly interminably) on a feature called "Small Cameras We Love," for which this is apropos.
(Thanks to Oren)
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Original contents copyright 2011 by Michael C. Johnston and/or the bylined author. All Rights Reserved.
Featured Comment by MiTaka: "Hi Mike, as a frequent TOP reader I am glad you found my comparison pic interesting. I have made it to show the size of X100, compared to other compacts with attached viewfinders. Note that I have put the images together, but the pictures are not mine. They are property of their respective owners.
"To answer some of the questions: G series are the same size as Nikon P7000. Two Canons in a single pic is too much for me ;) . I am not interested in comparing to film cameras, it's a moot point for me. They are just different. I must admit I forgot about Ricoh.
"P.S. Boy am I glad I didn't host this image on my personal site."
Mike replies: Thanks for doing everyone a service, MiTaka!