I was talking to Duncan about this project yesterday, about whether they'll do more in the future. That's the plan. And I pointed out that in fact, it's been surprisingly hard to do this reasonably well. There's a lot to keep track of, and if you don't want it to be purely formulaic, you need to keep changing things subtly. Let your protagonist make a choice, but then have the choice lead her to places she didn't quite expect (just like the real world does). One of the most interesting things is that each major fork actually changes the character of your protagonist, so that both her and her world are subtly changed from that point forward. If you compare all the endings, the protagonist in each of them really ought to be recognizably different -- sometimes, they wouldn't even like each other. That's been a lot of fun to play with, and has made the project really interesting overall, but it's also surprisingly difficult to do well. I think there are plenty of good writers who write lovely and/or hot erotica who just wouldn't be suited to such an intellectual sort of writing project. Funny, for what will end up a rather fluffy book. :-)
It does look like there will be one more round of line edits after I finish these structural revisions, so those of you on my readers' list can expect to get an RTF copy of the whole damn thing next Monday or so, and I would *love* line edits from those of you who have time. Especially for consistency issues; what with all the revisions, it's tricky keeping track of exactly what each Kathryn knows at any given point, or what's happened to her, for example.