Last week, Ben spotted, and I reported on a Google OneBox Q&A Adult Spam. Matt Cutts confirmed the issue and said it has been fixed, which it appears to have been done.
Matt said:
I checked into this, and it was an issue in the Onebox extractor code. I think it's fixed now; thanks for mentioning this.
Continued forum discussion at Search Engine Watch Forums.
This article was written the night before, and scheduled to go live at this time.