Lets be serious

The eruption in Eyjafjallajökull is a truly huge thing. Its under a thick glacier - a massive glacier - and in a crater that is like a bowl full of ice.
So the three craters (its a radarpicture of the craters not an X-ray of yours truly) pour out molten lava thus melting the ice. You really only need a couple of degrees Celcius to melt ice (slowly) but you get 800°C...
So masses of water melt (see here) overfilling riverbeds,  and its really thin mud rather than water. Meadows disappear, drainage canals level out with the meadows, roads are cut, bridges threatened, farms and villages are sealed off, the tourist industry suffers as scared foreigners are scared to (fly) sail to Iceland and we can't get our fresh fish out - fresh - and we don't get the things we need from abroad.
While there is water getting into the crater we get the ash - when there is no water or insignificant water getting in we get lava. And believe you me - if you think this (from a satellite) and this is a problem look at this and this and this (evacuation area) and this...

We get wonderful pictures - even if they are only made from a webcam (see below - made at lunchtime April 17th 2010)! 

And you have to see these - go through their collection - its staggering!

But hey thats life. Lets face it. We may be able to genetically analyse all sorts of things, and alter them and clone and what not. We may be able to control nature up to a point but there  you are. When we get down to the nitty gritty - nature rules and we should respect that.
After all - we have to...see here and here