I also noticed that when updating apps, if you click update all, then you can change the email address of the account, which allows you to update any apps that were purchased with a different iTunes account. From what I recal, with the previous version, the email address was always greyd out.
As I am not the only one experiencing this I feel that everyone should at least be made aware of the problem. 2.2.1 breaks Wi-Fi. The forum at Apple has 1500 post of people echoing each other on this issue. If you haven't updated to 2.2.1. yet DON'T. Unless you never use Wi-Fi