TinyPwn: Backup SHSH Blobs and Jailbreak All iOS Devices Using Custom IPSW Files
TinyUmbrella developer notcom is working on another tool TinyPwn which will allow you to customize IPSW firmware files. It will enable users to backup their SHSH blobs, create custom IPSW firmware files and jailbreak your iDevice without upgrading you baseband so that you can unlock it. TinyPwn will be compatible with all OS including Windows, Mac and Linux.