One more tweak, related to the importer faq (http://www.dreamwidth.org/support/faqbrowse?faqid=86)

"Crossposted and duplicate entries will be detected and won't be imported." -- just got pointed out to me that we should make it clear that comments for crossposted entries get imported. That basically, crossposted entries will not be duplicated upon import; comments on crossposted entries will be imported and merged with those on the original entry on DW.