I have an iPod Touch 3g (32GB) - Model MC008LL. It is jailbroken on 3.1.3 (7E18).
I am looking to upgrade to a 4.x.x firmware, whether that is 4.0, 4.1, or 4.2.1.
Yes, I know, greenposi0n is out, same with limera1n, sn0wbreeze and redsn0w. These all can complete untethered jailbreaks for MC...