The Eyjafjallajökull plume seen by Terra
NASA's Terra satellite snapped the above image which clearly shows the extent of the plume. It is a large enough eruption to cause concern on the ground and evacuate surrounding areas, and disruption of the heavily used northern Atlantic air traffic lanes is beginning to cause congestion.
Still, from an orbital perspective it makes for quite a beautiful photo-op, don't you think.
Image credit: NASA/MODIS Rapid Response Team