I don't think Jaguar did this ... you can drag and drop items from the Dock by pressing Command before you grab the Dock item. The Finder key combos work with Dock drag and drop, too: making shortcuts, copying or moving the item with Option and Command, Option, or just drag and drop off the dock, as usual, to remove it.
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Mac OS X Hints
http://hints.macworld.com/article.php?story=20031025070122403