It's online and free to download:
I'm not mailing this around widely because I want to trial this on a smaller basis, but feel free to pass the link on to your friends.
There will be another story online in a couple of weeks. I hope you enjoy it!
EDIT: I've also had a redesign of the shop. It's a lot nicer now! There are still a few rough edges, but it's getting there. Let me know how you get on with the interface to download things.