ok well if youre trying to get 3.0 software on your ipod touch 2g it wont work. if youre trying to jailbreak the software 2.2.1 then go to redsn0w.com. there is the official jailbreak for ipod touch 2g OS 2.2.1
there is no jailbreak for ipod touch 2g OS 3.0 yet.
if you want to wait for the OS 3.0 jailbreak for ipodtouch 2g check on this website: http://blog.iphone-dev.org/