So I've googled a lot, and I'm not sure what I'm looking for. Am I looking for the official 2.1 firmware, or a jailbroken firmware?
Also, doesn't QuickPwn create its own firmware?
I know it's from a different site, and thus Bad Ash's dogmatic defense of tutorials doesn't apply, but
here...
How to jailbreak your iPod Touch running the 2.1 firmware (OS X) - Simple Help
...there's a tutorial that shows using just QuickPwn, without additional firmware. Regardless, I've used QuickPwn and it freezes at the progress bar, right when iTunes first opens.