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Using the recently released redsn0w, I was able to easily jailbreak my iPhone 3G with the new 3.0 firmware. It really works…as the screenshots show you. If you’ve been waiting to jailbreak your iPhone 3.0, now is the time. Whether you use a Mac or a PC, redsn0w allows you to get the jailbreak done quickly and easily.
Follow this guide: How To Jailbreak iPhone OS 3.0 On Windows and Mac Using Redsn0w
Feel free to ask questions.