I’m adding the following new resources to The Best Year-End Collections Of Images — 2012 (you also might be interested in The Best “Year In Review” Features That Aren’t Photo Collections — 2012):
Nature has some great “year in review” features, including photo collections.
Looking Back at 2012: Ideas for Reflecting on the Year and Teaching With Retrospectives is an excellent lesson plan from The New York Times Learning Network.
The Boston Globe Big Picture has a series of year in review photos:
Best nature pictures of 2012