- Some optimized sites that are being changed for better relevance are just not performing as well. Their rankings seem to be doing worse.
- "Boring websites" with no linkbait are vulnerable to ranking shifts.
- Bigger sites do better. ("Size does matter.")
- Some datacenters have shown changes, but they reverted to their original rankings. Forum members suspect it's part of a new data push (or experimentation, at least).
Forum discussion continues at WebmasterWorld.