Apart from being a great initiative, this is the closest to a RESTful client I’ve seen. Although Jason (the json format) is not standardized yet, it has a rich set of affordances. Android and web versions are on the works, keep an eye on https://github.com/Jasonette/
I’m not sure what to think of this yet. My spidey sense tells me it’ll work for small, toy apps but not for moderately complex apps. I don’t have much to base this on, though.