In some cases the posts themselves are not particularly useful. I don't think the Numpty Physics post itself was all that hot, it's just that it let us know that Numpty Physics was available. Some of these posts I read every morning just after reciting the Pledge of Allegiance, but some I hardly ever read. To get a real "usefulness" statistic, I think one might take the number of thanks and factor in the number of times the post has been read somehow. This list is great, however -- I hope it or something like it becomes part of the Wiki.