Can HTTrack grab files linked to within conditional comments for Internet
Explorer?
If not, anyone up for adding support?
I personally do not advocate their use (I'm vocally against it, actually), but
some
people do use them and being able to fully mirror a site quickly helps me to
help
them debug.

About Conditional Comments:
<http://msdn.microsoft.com/workshop/author/dhtml/overview/ccomment_ovw.asp>