Looks like the Apple software update servers are acting very oddly this morning. They are sporadically going down, then back up. Could this mean iOS 4.2 is imminent? As we near the end of November, it isn't unreasonable to think that Apple is getting close to releasing iOS 4.2. As of now, I've had the update servers tell me twice the update servers couldn't be contacted. Once it told me my software is up to date. We'll keep checking!
And a friendly reminder to jailbreakers, make sure you save your SHSH blobs and don't get too update button happy. If you'd like to keep your jailbreak, make sure you don't upgrade to iOS 4.2 until a jailbreak released.