Last year, the Interaction Design and Children conference was held here; unfortunately, it was during finals week, so I was only able to attend a couple of sessions. The ones that I did go to were excellent. "Interaction design" was used very broadly, and I saw sessions both from academics and toy industry types, about television, video games, software, and physical toys (like an interactive Barney doll).
I just found the full proceedings from this conference online - warning, I'm not sure right now if you need a university login to view this or not. I now have quite a lot of reading to do!
