I can't write on a chalkboard or be in the same room as one that is being written on. The sound and feel of them gives me a perpetual shiver and extremely strong physical reaction.

The chalkboards would be a significant hindrance to my productivity. I much prefer a whiteboard for this reason.

It appear's we're in opposite camps. :)

I don't object to the sound or dust so much as how much of a pain in the bum they are to write on. Whiteboard lets you write pretty accurately when you want to, whereas chalkboards and sticks of chalk seem to reduce anything other than large sweeps to painful scratchings.

They look very trendy / counter-corporate, but I'd hate having to use the things.

What about dust?

Canned air should be as fine as it is for other kinds of dust. Chalk is basically inert, so there are no worries about affecting electronics or anything like that.