Good news for all iPhone and iPod Touch users who are running jailbroken iOS 4.1 firmware on their devices! Hackulous has released the AppSync 4.1 for iOS 4.1 firmware. It is now available in Cydia to install. You could use AppSync 4.1 to install cracked apps on iOS 4.1 firmware on your iPhone or iPod Touch.
You would first have to jailbreak your iPhone or iPod Touch to install AppSync 4.1 from Cydia. Few days back a jailbreak for the iPhone 3GS on iOS 4.1 was done through an unofficial PwnageTool. Now when the jailbreak methods for other devices are released, you could do it and install AppSync 4.1 on your device. And the happy news is that SHAtter has confirmed the jailbreak tool to be released soon for all iDevices on iOS 4.1.