I just upgraded to 4.0 on my 64 GB Third Generation iPod Touch and decided I would rather have my jailbreak. Knowing that this was a possibility I saved my files backups etc. But once I downgraded to 3.1.3 I decided to run spirit just for kicks. I had heard that iTunes 9.2 blocks the spirit jailbreak but it worked flawlessly. Not complaining, just curious if this has ever happened to any of you.