Well, I've found a few rather huge and glaring bugs in the new Sightseer, and fixed them this morning. It wasn't forcing login for some of the submission pages (like, say, feedback and comments) and was 500ing when you submitted them because there was no @user. The all-categories page was also broken. Yahoo's slurp keeps hitting a weird version (no 'filename') of the kml links, so I added a route for those so they wouldn't 404 anymore. And I also saw some people who have bookmarked the old submit page, and added a redirect for that so they end up on the new submit page.