When I first saw the claim on NTK's website that this had leaked into many other websites, I found the claim difficult to believe. I figured few things went through Yahoo! email and became web pages without a quick review (or is that an eval?). A quick search on Google, however, verified the awful truth. I was shocked by copies of New York Times book reviews with medireview in place of medieval, a medieval leather email list with subject lines transformed from medieval glue to medireview glue, a curriculum vitae including the word, and even SCA pages using it. Over 1,170 results on Google for a word created by Yahoo!.
I guess the moral is: Don't rely on a Yahoo! for protection.