Some of us here at NU CS are kicking around the idea of using the concept of Linda Tuple Spaces for ubiquitous computing infrastructure.
If I've learned one thing though, if you think you've got a good idea in computing, odds on someone else has done something like it already.
Enter Lime, Linda in a Mobile Environment, by Amy L. Murphy, Gian Pietro Picco, and Gruia-Catalin Roman.
Luckily, Lime doesn't really attempt to address some of the issues we're interested in, so it's not a direct competitor. Heck, it's probably worth investigating as an initial codebase to modify for our own ends.