Since the last upgrade of 3.1 I've been experiencing these problems: - iPhone not responding (saw the thread already). Forces me to reboot - choppiness and delay. Feels like my old PC. Especially when I'm unlocking the iPhone - 3G service seems to go to limbo. Some of my apps have a hard time. I used to reboot but now I disable my 3G, wait for the edge and then switch back. After doing that I notice some of my push applications and other apps (eg weather, stocks) update. Very annoying! Especially with AIM. My iPhone is not jailbroken. I hope there is a fix coming soon!!