Well, this is embarrassing.
Fed up that I couldn't get the Jailbreak to install, I tried installing the screen saver hack. And it installed!
I believe what happened is the jailbreak worked the first time, but when I attempted to install the screen saver hack, I did that wrong (maybe I dropped the uninstaller instead of the installer? I can't even guess).
When the hack didn't install, I assumed I didn't install the jailbreak correctly. So I kept trying to install it.
I wrote a reply to you, Yifanlu, where I explained my new device couldn't possibly be already jailbroken since I've been the only owner of it, but the thought just kept nagging at me; thanks for the help! And the jailbreak!
Sorry that this is of no help to those still trying, but I did successfully jailbreak my Kindle 3 with 3G running 3.2.1 (non-ad-supported version).
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