I was finally able to get some of my burning problems straightened out (note my posts on some of the recent, similar threads). It seems that Nero is unable to burn compressed, read-only .img files created with Disk Copy (which makes sense to me, since Nero would have to uncompress the image and obviously isn't quite that smart). I also had problems burning SOME images created by Disk Copy as Read-Only, uncompressed - I'm not sure what the difference is here.
What I've found works 100% of the time is to take images and convert them to Toast-format image files with the "Save as Disc Image" option in Toast Titanium 5.0. Then I can transfer the file one of my PC (with FTP, via CIFS with Dave or SAMBA, etc), and burn the image in Nero by using walrusjb's method above. Nero doesn't automatically detect the image type, so you'll still need to select "HFS" from the drop-down list, and use the defaults. So far, as long as I don't see the "image isn't aligned to byte" error message, then things work great!
This is great! I'm finally able to make backups, CDs, etc. that I've desperately needed without having to spend the unecessary cost of buying a whole new burner, or an IDE card for my dilapidated 7300.
Ian