This jailbreak method works on iPhone 4/3GS/3G running 4.0 or later software. It works on iPads running 3.2 or later software. It also works on iPod touches running 4.0 or later software. It works ANY and EVERY iPhone/iPod touch/iPad running the latest software possible (up to 4.0.1 as of 8/01/10).
JailbreakMe:
http://jailbreakme.com/
http://jailbreakme.modmyi.com/
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* I am NOT responsible for your iPhone, iPod touch or iPad. If something goes wrong, that is YOUR choice. I hold no responsibility for any damages that might occur when using this method.