I'm not too sure who is familiar with Web of Trust, so I'll start with a brief description. It's basically a browser app that inserts a circle next to text links in websites. The color of the circle indicates whether or not it's average rating by users rates it as having a "good reputation" (green) or a "bad reputation" (red). There are four criteria: Trustworthiness, Vendor Reliability, Privacy, and Child Safety.
Singularity.org's printout is here. As you may have guessed from the title, Web of Trust lists Singularity.org as "poor" in trustworthiness, vendor reliability, and privacy. There's a comment that, when translated (via Google translate) says "Mass mailing of non-thematic Forums". It's also commented under the category "malicious content/viruses".
I'm not entirely sure how these ratings are generated, (How Ratings Work, related) but I've used it for several years, and this is only the second time I've disagreed with a rating. I've always found WOT to be very reliable, and a decent way of warning me if a site is unsafe so I don't have to think about it. So I was fairly alarmed when I saw the red circle there, since I'd imagine it's turning away people that don't know any better. If LW had a red circle, I never would have come here. I'm not sure what SI or LW can do about it, but there's a "click here if you are the owner of this site" button, although I don't know what that does. I've left my own rating on there, but it didn't seem to change the overall rankings.
Edit: When I made this post, the scorecard read Trustworthiness 30, Vendor Reliability 31, Privacy 31, Child Safety 100.
When you write a comment, you also have to select one of options, such as "Good site", "Useful, informative", "Malicious content, viruses", "Phishing or other scams" etc. I wouldn't be surprised if this kind of data was also used somehow.
Perhaps this would explain the small differences in rating -- for example currently "singularity.org" has "Trustworthiness" and "Vendor reliability" 60, and "Privacy" 58, and I suppose that people click the same answer to all of these. (Alternative explanation is that the rating is on the scale, and they simply clicked a different pixel.)
The page expressly says "Supplement your rating by leaving a comment. Comments provide more information, but do not affect the reputation."
If you click "Rate this website" you can rate each scale as you wish. Surely some users choosing different values on the scales is a much simpler explanation than that the site programmers built in a more complicated rating system then lied about it?!