We're actually killing the in-joke tag for a lot of the reasons you cite. (Well, mostly that it was a dumb idea.) That said, we're well aware that the tag system isn't perfect, and you raise a good point about the community building aspects of tagging on S_D. Actually, in that sense the marriage with delicious tagging could work perfectly because an alternate possibility to just simplified tags on dw is allowing the dw tags to develop organically and having extensive, organized tagging on delicious for maximum archive searchability. The volunteers are the ones we'll be discussing and field-testing this with, though.