n80: we'd need to keep track of which changesets had been applied and which not
and which are remapping or deletions and should definitely not be applie
you could post the basic data about an osm changeset using a short bounding box the basic data in it and a link to the data in twitter and then aggregate the data. this could use a geohash or something similar to easily select the area.
We want to view the changes in an area, like the itoworld tool does, but as a central part of the system. http://www.itoworld.com/static/openstreetmap_tools/osm_mapper.html we need to be able to subscribe to the changes as a georss feed