"sito" (which, in all its glory, really means if "a bunch of us" seem to like the idea! haha) would be willing to host it, i think its safe to say. there are definite technical (and people-energy!) things that we need to conquer.
not to mention just coming up with a good set of "game-rules" to play by, which has always been one of the cornerstones of what makes or breaks sito synergy fun.
certainly flash would greatly reduce the number of people that could be involved (flash-building as opposed to flash-using, i mean). and thats an important thing "we" take into consideration. something as limited as flash-building-collab, therefore, would take a kinda second seat to more inclusive (and busy!) projects we might already have going on. again, the shortage of various energies.
but this discourse is good -- it gives us an idea of who is interested. in a parallel sito universe, we would probably have some sorta advanced suggestion and voting mechanism to come up with new ideas!!