An interesting slideshow at New Scientist shows that the eruption of Eyjafjallajökull-Fimmvörduháls in Iceland barely even ranks as an eruption, compared to past geological events (not limited to volcanic action).
Incidentally, if you want to know how to pronounce Eyjafjallajökull, there’s a Wikimedia file here. To be honest, even after hearing it pronounced correctly, I can’t reproduce it . . .