As 2010 and 2007 are preparing to battle it out in July I figured I'd try and make some ice concentration map animations from the University of Bremen of both years, to see how they compare. The archive for these images can be found here.
As always I advise to focus on specific parts of the maps and not try to take it in as a whole. I've slowed the animation down a bit (2 sec. per frame) to make it easier to compare. Here it is:
When focusing on specific parts of the Arctic there's plenty of differences to see of course. I'll mention one remarkable difference: Hudson Bay. At the 2010 end date of the animation there is hardly any ice left. This steep drop is plain to see on this graph from Cryosphere Today (hat-tip to Wayne Davidson):