Nontheless, the present humble results can be downloaded from Mashup station here.
I've skipped a lot of stuff in the present release just to get it working at all. So at the moment it is only possible to wire together infotrons residing in the same page, with no fancy proxying or domain-stuff. With some luck I'll get that in in a couple of weeks, RL work admitting.
If you haven't read the specification yet, please do so. It's a good read and a warm, fuzzy wow-feeling inducer. you can find it Here.