So, Yahoo! may be ignoring it. That probably means that the others are too or they haven't quite figured out how to deal with it. Either way, there's this round robin thing going on. If Google is the only one supporting the nofollow attribute, which I'm still not convinced is happening 100%, what purpose does it really serve? If those links are being picked up and regurgitated elsewhere because that original nofollow attribute was not adhered to, how does that effect the whole process?