Island uncovered by retreating Greenland ice (
http://www.ananova.com/news/story/sm_2291294.html).
Everyone believed Warming Island was part of the massive island of Greenland. Then retreating ice uncovered that it was apparently a peninsula connected to the mainland, then the ice retreated further and it became apparent that the landmass in question was an island.
And here I sat thinking that we wouldn't discover more islands in the year of 2007. Global warming proved me wrong:p.