Wouldn't it be nice, I ask myself frequently, to have a collection of open and free virtual manipulatives and videos sorted by particular multiplication models? Steve Thomas and I are going to aggregate such a collection over the next few weeks, and you are invited to participate. If you have open and free interactive software, videos or articles about multiplication models, would like to prototype some models rapidly, or even have software development ideas, please join our asynchronous seminar here: <a href="http://mathfuture.wikispaces.com/MultiplicationModels">http://mathfuture.wikispaces.com/MultiplicationModels</a> We will use better tagging and sorting tools, but this is the starting page for now. The project is in part based on an SBIR grant Natural Math had for developing game prototypes. We hope to use it for sustainable research and development, including grant and publishing efforts, in the near future. Cheers, Maria Droujkova Make math your own, to make your own math.