Some extra reading.

A few follow up links from yesterdays rant:
The Daily Mash take on the matter.
A little something from the wonderful Cocktail Party Physics.
Astropixie's take, which actually prompted the post.
The Met Office VAAC charts page - that's Volcanic Ash Advisory Centre - (don't look too hard at the title, it stands for Volcanic Ash Graphic, ok? Nothing dirty with that at all...) and another Met Office one that gives some of the reasons behind the model.
One last (for now) Met Office one giving some gen on the particulates found in the dust layer.
A Norweigan model animation of the ash, but I'm not sure of what it specifically shows, I've mainly included it cause it looks cool.

And for a bit of a change, Kate's sister's post that was referenced by Ben Goldacre in his miniblog links.