iPhone Dev Team has released an updated version of Redsn0w. The new tool has contains bug fixes so nothing special other than its version number has become more complicated and lengthy. Its Redsn0w 0.9.10b8b. Download links are available below.
This is what the dev team’s blog says:
The 0.9.10b8b update to redsn0w makes the zip files more compatible with the native Windows explorer (which doesn’t like leading slashes in the filenames).
So, if you have already jailbroken your device using the previous Redsn0w update then you don’t need to do anything. If you are looking to jailbreak after a fully wiping everything or you are jailbreaking for the very first time, then you are always recommended to use the latest version.