As rumored Apple has released the iPhone firmware 2.2 today. This is a warning to all users who had either jailbroken or unlocked their iPhone or iPhone 3G, this warning even goes for anyone using the iPhone 3G who had not done either, but may want to unlock in the future.
I strongly advice these users not to upgrade their iPhone firmware to 2.2 until the iPhone Dev Team had released an updated version of their PwnageTool.
This applies to the new version of iTunes 8.0.2 also, as we currently do not know if the latest version of iTunes will be compatible with jailbroken or unlocked iPhone and iPhone 3G.
I will update here when it is safe to upgrade your iPhone or iPhone 3G, please stay tuned.