Hot on the heels of the release of iOS 5 beta 7, MuscleNerd announced on Twitter that he has updated RedSn0w to bring support for the latest beta firmware.
Up until now, if you wanted to jailbreak iOS 5 beta 7, you had to point RedSn0w to beta 6. It worked, but it wasn't ideal. By pushing RedSn0w 0.9.8b7b, the Dev Team makes things square, allowing you to jailbreak beta 7 by pointing the tool directly to beta 7...