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Let's say I set up a section of my website that aggregated content from major news outlets and bloggers around a certain topic. For each piece of aggregated content, is there a bad, fair, and good range of word count that should be stipulated? I'm asking this because I've been mulling it over—both SEO (duplicate content) issues and copyright issues—to determine what is considered best practice. Any ideas about what is considered best practice in this situation? Also, are there any other issues to consider that I didn't mention?

For reasons I won't get into here, I need to move most of my site to a new domain (DOMAIN B) while keeping every single current detail on the old domain (DOMAIN A) as it is. Meaning, there will be 2 live websites that have mostly the same content, but I want the content to appear to search engines as though it now belongs to DOMAIN B. Weird situation. I know. I've run around in circles trying to figure out the best course of action. What do you think is the best way of going about this? Do I simply point DOMAIN A's canonical tags to the copied content on DOMAIN B and call it good? Should I ask sites that link to DOMAIN A to change their links to DOMAIN B, or start fresh and cut my losses? Should I still file a change of address with GWT, even though I'm not going to 301 redirect anything?