WinPWN
Rachel got me a new iPhone 3G for my birthday, so I unlocked my old* iPhone using WinPWN and gave it to her. WinPWN also installed Cydia, which is basically Debian apt for the iPhone. So now I have a crippled, locked down iPhone, and Rachel has one with a complete Unix toolkit, reworked BSD subsystem, and access to a huge library of free open-source games and utilities. But hey, mine’s still faster. 😛