Phil,
can you give some more specifics or point to a particular message? Because there are three distinct categories of "stuff" to consider.
One is simple links to other pages on the web. Those should work for the most part, though there may be some spefic URLs that give problems.
Two are linked images hosted on other web sites. Those should work as well, again there may be a few that don't.
Three are images that were uploaded to ngdiscussion.net before the Late Unpleasantness. Don has them, but I don't think they've been uploaded yet. Once they are, they will probably look like category Two to the software here - for whatever reason, the conversion script we used did not convert attached images. (The old software kept images as distinct files, the new softwares stores images as entries in a database.)
JAC