GreenPois0n tool have been updated by the Dev Team to give support for the iPod Touch 2G ( MC and Non MC models) on iOS 4.1. You could now use GreenPois0n on Windows, Mac OS X or Linux to jailbreak iOS 4.1 on iPod Touch 2G. You could get the updated GreenPois0n tool from the official website.

Jailbreak iPod Touch 2G 4.1 (MC Model Also)

Follow the guide posted here to jailbreak iPod Touch 2G Â (MC Model also) on iOS 4.1 using GreenPois0n.

Download GreenPois0n from here.