Comex has brought back the userland jailbreaks for iOS 4.0 and 4.0.1.  This jailbreak is completely doable from your ipod touch or iPhone and supports the iPhone 4.  However, DO NOT upgrade past 4.0.1 or you will no longer be able to use the jailbreak.  successfully ran the jailbreak from an iPhone 3G @ 4.0.1 which I had previously jailbroken on 4.0 with Redsn0w.  As I started jailbreaking with Quickpwn, a userland jailbreak is new to...