*This technique will NOT work with Android 4.0 (Ice Cream Sandwich) or newer*
New improved version which also allows the password or PIN to be reset so you don't have to reset your device can be found here: Screen Lock Bypass Pro
Screen Lock Bypass has been used by tens of thousands of people to successfully unlock their device after they forgot their password, pattern, or PIN.
1) Login to the web based Android Market.
2) Install this application to your registered device.
3) Then install any other application you wish, it will trigger this application to run and the Screen Lock will be disabled.
This application will also run each time the device is booted so you can always bypass the lock screen.
This application does not remove or reset your pattern/PIN, it only temporarily disables the lock screen so you can access your device and backup your data before resetting it.
To remove Screen Lock Bypass, open the application and click Uninstall.
This method will not work on certain devices, but give it a go, it is free after all!