RedSn0w is Jail breaking and unlocking tool for your iPhone and iPod. Redsnow 0.7.2 has GUI interface which make iPhone Jailbreaking and unlocking much easier.
Developer rolled out Redsn0w 0.7.2 because o.7.1 has few bugs.
Redsn0w 0.7.2 Download Link for Windows and Mac
- Download for mac
- Download for Windows
Make sure you follow a proper working guide before trying to Jailbreak your iPhone using Redsnow yourself.