ZiPhone is a free and open source utility to hack or jailbreak Apples's iTouch or iPhone, removing all the restrictions imposed by the original firmware, Available in both Windows and Mac flavors, the utility is the fastest and most easy to use method to jailbreak iPhone and iTouch.

Once unlocked you can use your iPhone on any network and install applications of your choice on your device, however keep in mind unlocking your device may void your device warranty.

Adam Boileau, a security consultant from New Zealand released a utility to unlock a Windows PC in seconds bypassing the standard Login/Password requirement, The utility named "Winlockpwn" makes use of a vulnerability in Windows handling of Firewire port, the hacker needs to physically connect a Linux based computer to the victims Firewire port and execute a command in order to get unrestricted access to the victim's PC, The need of Firewire port and physical access to the computer makes the hack difficult to execute and less potent.

http://www.megaleecher.net/Unlock_Windows_XP