The iPhone Dev Team has just released another update for Redsnow 0.9.7 to fix Skype issues on iOS device. Redsn0w 0.9.7b6 is available for Mac OS X users only and in next version, the target will be adding iOS 4.1 monte so you don't need to pirate iOS 4.2b3 to allow untethered jailbreak on iOS 4.2.1.