Bing and Yahoo! traffic returned a couple days ago, currently at 66% of the level it was before they dropped the 301'd content, still rising. Looks like it was basically a four week penalty for moving.
And the funny Google story for the week is that they quadrupled the traffic to one of the original pages on my hobby site, from around 200 visitors a day to 800. What makes it funny is the page is a longish (around 6,000 words) first person account of some medical problems I had a few years ago, something I had put out there after failing to find anything useful (to me) on the subject. It's more questions than answers, doesn't have any authoritative incoming links I'm aware of, just some forum mentions and scrapers.
All I can think is it may have benefitted from an overall rise of site authority, given the fact that the 301'd pages came with thousands of organic links stretching back 16 years, and some of that might be passing to the medical page via the home page. It's not even remotely related to the rest of the site, I can't think of any words that it would even share, other than "the" and "I".
It's just so ironic that Google kept using the medical example when talking about quality, would you trust this site to give you medical advice and all that. I suppose people do trust the site because they e-mail me questions all the time and there's no advertising, but I start off by telling them I'm not a doctor.