Iain noticed that hunch.net had zero width divs hiding spammy URLs. Some investigation reveals that the wordpress version being used (2.0.3) had security flaws. I’ve upgraded to the latest, rotated passwords, and removed the spammy URLs. I don’t believe any content was lost. You can check your own and other sites for a similar problem by greping for “width:0” or “width: 0” in the delivered html source.