After updating to 3.1, I noticed that when I connect to a Wi-Fi network, I don't get the "Forget this Network" button anymore. It looks like they changed it to "Auto Join" with an On/Off slider. It appears to have the same behavior as forget this network, with one key difference. Before, if you forgot a network and later came back in range, tapping on the network would turn on "Auto Join" again. Now, if you tap it, the iPhone will join the network, but it will not auto join in the future. However, I cannot disconnect from the wi-fi without toggling Wi-Fi Off/On or toggling the auto join slider. Kind of annoying, but not life-threatening. Has anyone else noticed this? I should mention I'm using a Wi-Fi network that requires a login through a web page to get internet access.