The story which Jill co-authored with Michael is called "Beneath the Skin" and it is available in the collection Tesseracts 12, published by Edge Science Fiction and Fantasy Publishing, an Imprint of Hades Publications Inc. Mailing address -- P.O. Box 1714, Calgary, Alberta, T2P 2L7, Canada.
Edge publishes a *lot* of SF and Fantasy, but I have noticed one unfortunate problem with Tesseracts 12 -- it isn't available yet on Amazon!
We went to the World Fantasy Convention, which was held this year in Calgary over the Hallowe'en weekend. While we were there, Jill met with the people from Edge, and had a chance to do some book signings. Michael and Jill talked with Colleen Cahill, who subsequently wrote a positive review which appeared in the SFRevu website.
Karl Schroeder thinks this could be the best Tesseracts anthology yet, and hopefully a lot of people will agree with him.
There will be an opportunity to do more book signings in a couple of days -- Bakka-Phoenix Books is having a launch party for the book here in Toronto. Besides Jill Snider Lum and Michael Skeet, Claude Lalumiere (the editor) and David Nickle are expected to be there. I understand that possibly some other authors of stories in Tesseracts 12 may be there as well, but at this point I don't know which ones.
Bakka-Phoenix is located at 697 Queen Street West, in the middle of the first block west of Bathurst, deep in the heart of the Queen West Village. Directions to the store are available from their website.
UPDATE:I was wrong about the book not being available through Amazon. The issue was that I did a search on "Tesseracts 12" and got no results. However, it works just fine based on a search on "Tesseracts Twelve", which is the correct title of the book.