Do you think they were hacked?
http://seoblackhat.com/2006/08/23/how-google-could-stop-adsense-arbitrage/
Check this out:
http://www.searchenginelowdown.com/2006/10/googe-now-that-just-sounds-nasty.html
That's either misspelled or a really bad graphic.
The stem is definitley part of the the "G graphic."