Well, I'm not sure about secret, but it sure is mysterious. http://alpha.managedq.com/ showed up in my visitor logs, and visiting the site it looks like rather a nifty visual search interface. It's got thumbnails of the top results, and automatically generated keywords sorted by type down the left side:
The interesting part is that most of the site is returning 404 or authorization errors, which makes me wonder if they might still be in stealth mode? Unfortunately email messages to their public email@example.com address bounce, they've got a private domain registration so I can get any contact details from that, and Google searches don't get me any more information, so I can't check with them before mentioning it here.
They're using snap for the thumbnails, and I'm not sure how they're pulling out the tags. The keywords definitely look automatically generated, rather than user driven. I'd love to know more about their work, so if anyone has more details or a way to contact them, email me or add a comment.