His results are similar to private studies I've done for other vertical markets, where Google Analytics is leading the pack, then a slew of other tools. But it also shows a large proportion of those sites don't appear to be using any web analytics solution, something very surprising for such a competitive industry where optimization and behavioral targeting are key.
Click on the image to read Michael's full post.Note: in his comments, Michael notes WASP isn't detecting correctly eMetrics from Sophus3. This is fixed in the upcoming release.