Data from Terra's MODIS instrument shows that the Larsen B ice shelf of the Antarctic Peninsula collapsed and broken apart during the 35 days starting January 31st, sending 3250 km² of 200 meter thick ice into the Weddell Sea in the form of thousands of icebergs. This ice was already floating so will not directly result in a sea level rise. This would seem to be close to the climax of a break up that started several years ago.

See also:

• Antarctic Ice Shelf Collapses: an article from The National Snow & Ice Data Center
• Satellite spies on doomed Antarctic ice shelf: the press release from the British Antarctic Survey
• Larsen Ice Shelf 2002: a detailed discussion of the mechanics of ice shelves and their breakups from Christina Hulbe.