This is great. I work for a blog network that got hit similarly hard by both Panda updates, and we've done a lot of the same stuff (removing and/or de-indexing short/no page view content, improving our site map and linking system), but scrapers continue to be our biggest issue, especially the ones we don't syndicate to. These can rank higher than us in Google as well, and we continue to try to find a way to flag them or submit removal requests without having to do each one manually.

This is a great write up though, it's good to see that others are trying the same things as we are.