They get added to the comments on the matching DW post. I don't know about the ordering (I don't get enough comments for that to have been an issue), but I would assume it either tacks the LJ comment threads on after the DW threads existing at import time, or intersperses the threads based on the timestamps of the first comment in each thread.
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branchandroot
no subject
Date: 2009-09-25 04:50 pm (UTC)