Brendan,
Thanks for the info. I guess we'll start seeing AFCIs over here within the next few years then, although I expect they'll be given a different name, as with GFCI/ELCB/RCCB/RCD.
A few days ago I think someone (Sparky?) mentioned the possibility of using a single AFCI as a sub-feed to several regular breakers to minimize costs.
We already have whole-house GFI set-ups here (and elsewhere in Europe), and I have to say that I don't particularly like the approach. It can be a real pain when an earth fault on one ciruit knocks out power to the whole building.
What sort of price range are we talking for a single-pole 15 or 20A AFCI compared to a similar GFCI?