Another metric: Imagine an intro adventure for a modern human dropped into a D&D world.
Out of the adventures I know of, the one that comes closest is "Portal Under The Stars"; the PC could find themselves walking through the entrance portal, and then have to figure out how to deal with the various hazards; but those hazards are a tad more lethal than seems survivable, and there doesn't seem to be quite enough motivation to keep the PC from deciding to just sit and wait at the entrance. Contrariwise, "The Shambling Un-Dead" has some good motivation-kicker, in that the PCs have to go out and do stuff to clear up the barriers.
I'm open to converting some other D&D/OSR system adventure to DCC.
Does anything along these lines ring any bells?
Edit: In case it might spur some ideas, I'm thinking of using the ley line map from here as an excuse to open a portal from Niagara Falls, to the corresponding location in a world vaguely resembling the map shown here. After all, it's easy to come up with a reason for just about anybody to find themselves at Niagara - everyone from Superman to Red Dwarf's Dave Lister has popped in.
![Smile :)](./images/smilies/icon_smile.gif)