Just noticed this today while perusing the AppleScript area at Apple. I was looking for GUI Scripting to do download and install, but they seem to indicate that GUI Scripting is installed by default in Panther. One thing that I noticed on this page ... there is a little yellow "callout box" with this text:
If you're using Mac OS X version 10.3, click this icon to automatically open the script example in the Script Editor application.Alogn with the text is a little ApplScript document icon. If you click the icon, sure enough the sample script visible on the web page is opened cleanly in Script Editor. Pretty nifty!
Mac OS X Hints
http://hints.macworld.com/article.php?story=20031025124850372