We heard tons of very, very good things yesterday - I think. All the enterprise features mean it should have Blackberry's makers real scared, the App Store sounds excellent and so on.
One - possibly - very disconcerting thing was spotted by John Gruber at Daring Fireball: he found a section of the SDK that seems to say no multitasking for 3rd party apps. If they remember their state / where you were at when you left them, that's no big deal. But ... if they don't, that is Suckerama and equal to a Palm Treo. Here's the section he highlighted:
Only one iPhone application can run at a time, and third-party applications never run in the background. This means that when users switch to another application, answer the phone, or check their email, the application they were using quits. It’s important to make sure that users do not experience any negative effects because of this reality. In other words, users should not feel that leaving your iPhone application and returning to it later is any more difficult than switching among applications on a computer.
And his post is
here
Interested to hear what folks think on this ...