TheMadScientist - 10:54 am on May 5, 2011 (gmt 0)
Google has supported the cross-domain rel="canonical" link element since 2009.
It wasn't even a Cutts Video ... (I think I watched too many in one day. [Note to self - easy on the rainy day videos] lol) ... It was close: They started (Dec 2009) 2 months after this one was uploaded (Sept 2009): [youtube.com...]
I didn't remember going back that far on most things, but I watched that one as an 'after thought' and got my notes off a bit I guess ... Oops!