Hi. I don't really know the best way to do this, though I have thought about it over the years. I think things like Google Gears will be a big help with this sort of thing. But it should also be possible to write smart client-side libraries that let you you modify objects locally and only sync when they can. That would certainly be fine for new objects you create, and for tags you have control over, but would be more involved if you (and others) were offline changing tags over which you all had control. Those kinds of things tend to run into difficult issues - which is mainly why I say I don't know how to solve this (fully). Running a mini client-side FluidDB shouldn't be too hard, especially with things like sqlite being built into some browsers. But again, lots and lots of details.....