FSX/P3D. According to Mathijs, the Aerosoft team is putting together a nice little freeware to reflect real world global environment changes. They are working on modeling and placing breakaway icebergs in the North Atlantic region so next time you are on your next "cross the pond" sortie, you will have something to see passing below your wings besides an endless sea. More info via the source link and thanks to ADX reader Mohamed Amin Kaafar for the tipoff!
Update: Due to how FS handles objects and distance, this project has been canceled. It was a great idea though!