Jailbreaking ipod touch 2nd gen with redsn0w is the fastest method yet. All you need to do is just download the redsn0w and switch your ipod to the DFU mode. Although redsnow is still in beta version but you can use it without doubt. Just do it properly and you won’t screwed up your ipod touch 2nd gen. The process wont take a long time unless you have slow internet connection. Picture shows my jailbroken Ipod Touch 2nd Gen with Redsn0w v0.2.

Easily Jailbreak Your Ipod Touch 2nd Gen