Those who are keen to jailbreak their iOS devices should not update to yesterday's release of iOS 5.0.1. MuscleNerd on twitter has warned iOS users that there is no downgrade path from iOS 5.0.1 to iOS 5.0 yet. He also recommends that users wait until one is available before they update.
Jailbreakers and unlockers should avoid today's 5.0.1 until a flow for downgrading to 5.0 is developed.
Downgrade flow needs to be modified for AP "nonce" http://is.gd/b3G0io ... saved SHSH blobs are not enough to downgrade to 5.0