Google now offers us to use a new Original Source meta-tag.
meta name=”original-source” content=http://www.somedomain.com/article1.htm
How is this going to help us? I am sure it is going to help a highly-automatic-human-tester-driven-new-hamster-wheel-turning algo, but do we really need to augment hypertext markup language with another corporate cue?
It's probably good to note the original page on Google's blog was updated Feb. 11, 2011, and changes the implementation slightly. It also covers what should happen when rel=canonical is used:
We've had a lot of interest in these meta tags, particularly in how the syndication-source tag relates to rel=canonical. After evaluating this feedback, we’ve updated our system to use rel=canonical instead of syndication-source, if both are specified...