Oh, and a great summary of the limbo story in today's WSJ. (Maybe it's appropriate that they published it on Friday the Thirteenth? :-)).
One problem with all religious constructions of the afterlife is that they tend to be much too concrete. A literary construction, however, like Dante's "Divine Comedy" continues to awe and instruct because it works magnificently on so many levels, literal and figurative.
The Catholic habit is to let outworn theological idioms disappear through benign neglect. That appears to be what has happened to limbo. Already in the new "Catechism of the Catholic Church," published in 1994, we read of children who die without baptism that "the church can only entrust them to the mercy of God." But aren't we all in that position?
[Both links via Open Book]