For a limited time, the Winter Bash leaderboards are still live. (Hover over the abbreviated numbers to see the actual figures for "hats earned on a site".)
That's all we've got for now. We don't currently have plans to release more hat data, but if there is a way to publish it relatively easily we may consider it.
UPDATE: I looked into this, and it's unlikely to happen. The service we used to host the torrents for our regular data dumps shut down entirely without warning, and we don't have another torrent hosting system set up. Our priority is to get something back in gear for the standard data dump, but that will take a significant amount of time. Only then would we be able to think about releasing Winter Bash data, and by then way fewer people will be caring about it.
Maybe next year.