RedSn0w will be updated with iOS 5 downgrade support
Upcoming redsn0w release makes both TinyUmbrella and Cydia blob saves useful for 5.0+ (1st verifies, then stitches)
For time being, please just use most recent TU to save 5.0.1 blobs+APTicket...redsn0w will do the rest, should you need to restore.
We'll let you know as soon as the update to RedSn0w is available.
Follow us on