Been holding out for redsn0w before jailbreaking your iOS 4.1 device. Good news: the Dev Ream has just released the latest version which will allow you to jailbreak your iPhone 4, 3GS, 3G, 3rd or 4th generation iPod Touch and second generation AppleTV on either Mac or Windows machines. It uses geohot’s limera1n exploit, and also adds “custom bootlogos for iPhone3G/iPhone3GS/iPod2G users (with qualifying bootroms)” and an option that implements the ‘DFU’ button in PwnageTool” in Windows.
Interested? Grab it here, and let the hacking commence.