Vanessa talks about how Google supports cross-domain canonical tag. She touches on whether you should 301 redirect or use the canonical tag in certain situations.
She dives into Google News and requirements and gives suggestions.
Last, Vanessa talks about the changing SERP landscape including Facebook opening up content to be searched, Google Books and Google Maps using wikipedia to weigh searcher intent.
References:
Google Webmaster Central Blog: Handling Legitimate Cross-domain Content Duplication
Search Engine Land: Google, Yahoo and MS unite on Canonical Tag to Reduce Duplicate Content Clutter
Search Engine Land: Bing Still Working on Canonical Tag Support
