Charles Arthur at The Guardian has brought to light the fact that the Blog Readability Test so many of us have used is not exactly what it seems. If the site that provides the image ever goes down, it will default to an advertisement for an obscure company that is certainly a proxy. You can edit out the code that would default to the ad (I did when I first posted it because I thought it was annoying).
However, the site it is hosted at, Critics Rant, seems to have no knowledge of the test. It all seems kind of shady to me, so I'm removing it from my blog. If you've utilized the meme as well, you might want to read Arthur's article and see what you think.
H/T to Pharyngula.