Sn0wbreeze 2.3b2 was released by the iPhone Developer, iH8sn0w. This tool can be used to jailbreak iOS 4.3 on iPhone, iPod Touch and iPad. Sn0wbreeze 2.3b2 Features

Sn0wbreeze 2.2 has been released by ih8sn0w (developer of Sn0wbreeze jailbreak tool). It is Similar to the PwnageTool. Sn0wbreeze 2.2 uses the same exploit used in the GreenPois0n tool which will help to do Untethered Jailbreak of Apple devices which are run on iOS 4.2.1 firmware.

Sn0wbreeze 2.2, the latest version of Sn0wbreeze will be coming out soon. This was mentioned by iH8sn0w, the sn0wbreeze developer on twitter. Sn0wbreeze 2.2 tool will help Unlock iPhone 4, 3GS, 3G on iOS 4.2.1 by restoring the phone without upgrading the baseband so that you could unlock it using previous version of ultrasn0w. iH8sn0w: [...]

iPhone 3G / 3GS users can now Unlock iOS 4.2.1 using newly released Ultrasn0w 1.2. Unlock iOS 4.2.1 firmware on iPhone 3G / 3GS

We have got the Guide on How to Unlock Nexus S Bootloader. I already shared on How to Root Nexus S. Unlocking Nexus S is very simple. Follow the steps mentioned below to Unlock Nexus S Bootloader. How to Unlock Nexus S Bootloader