The giblet pack of the gizzard, liver, heart, and neck get cooked with celery and onion for stock to moisten the stuffing/for the gravy along with the drippings. The neck meat gets minced and added into the stuffing. The rest gets fed to the cats.
Some folks add the chopped organs to the gravy/stuffing (blargh) or just toss out the whole giblet package without using any of it.
What do you fellow Dopers do?