Here is a good list of active web cameras observing the eruption in Eyjafjallajökull at present time.
Vodafone Iceland web camera.
Míla web camera on Þórsfelli.
Míla web camera on Hvolsvelli.
Web camera from summer house near Hekla pointing at Eyjafjallajökull.
Rúv web camera that is pointed to Hekla. But you can observe the eruption from there at times also.