The tag cloud of clinical uncertainty is a graphical representation of the areas of medical research where we still don't have the answers that would help us day to day as practitioners. It is part of the new TripAnswers website, which takes a clinical question answering approach but allows comments from other users. At the moment the site does not seem to be fully functional, but I think it is a great idea.
And for some reason the Tag Cloud of Clinical Uncertainty makes me think of Bill Bailey. I hope that doesn't seem too irreverent ;-)