not sure if anyone mentioned this yet, but if you Apple-click a program thats in your dock, it will take you to the directory it's in in Finder and highlight it.
Am I remembering right, that if you Apple-Drag something out of the Dock you not only toss the icon out of the Dock, but also delete the program?
No. If you apple-drag the program out of the dock you move the program to wherever you drop it. but remember that this removes it from the applications folder, it moves the whole program, so if you apple-drag to the TRASH it would delete it, yes.