Hi again, Isabeau!
That's so cool that Kate herself tweeted you! I've only read the first book so far (they seem to be hard to find around ehre and I only chanced on this one at a second-hand table) but I'm dilligently trying to track down the rest. I loved it, and I don't say that about very many books anymore.
And since The Witches of Eileanan really raised the bar for me, I'll probably say it even less.
@ponylady: Definitely do seek The Witches of Eileanan! Superb first book, and I'm sure the rest of the series is even better. (I can't wait to get my hooves on 'em!)