The JPG on the official page has the Adobe RGB color profile embedded in it. Most browsers don't pay attention to this and assume sRGB, which is why people are generally told to convert to sRGB before uploading to the web. If you look at this side by side in Firefox 2 and Safari on a Mac, you'll see the difference. It's huge.

I have a power logo on my back. Well, technically it's a "standby" logo. This shot has a lot of blood in it. http://www.flickr.com/photos/thechrisproject/2717988863/