I've tried to find a way to preserve my Haloscan comments. I did find one person that did it but it involved Python scripts and wasn't exactly step-by-step. I have to remove them from the blog because Haloscan is shutting down.
I decided it wasn't so bad to lose my historical comments and reverted to Blogger comments. I have the comment dump from Haloscan so if anyone ever comes up with an easy way to import them I can still do that. I've thought about switching to Disqus and may still do so but for now, Blogger it is.