Six ways to experiment with AdSense and grow your earnings

Can anyone explain why the original blogspot post ( http://adsense.blogspot.com/2009/02/six-ways-to-experiment-w... ) links only to "invis.gif 1x1 pixels" ? I've been rechecking this url over past 12 hours with this same result.

Is this a hacking of blogspot? or something that happens there when a blogspot blog goes bad. Actually I note that the home blog page (http://adsense.blogspot.com/) also goes only to that .gif - odd, since surely this is a Google-developed blog, isn't it?