There are some news from the DevTeam released a new version of redsn0w - now with full iOS 5.01 support.
Before you had to select iPhone 5.01 ipsw to jailbreak it. Now you can skip this step.
Beside that, its now possible to create custom firmwares in windows as well.
Get it here:redsn0w 0.9.9b9b Windows and here: redsn0w 0.9.9b9b MacOS
It's still tethered so please be patient for an untethered jailbreak =)
Greets
/Matthias