MSNBC says the schedule is delayed by about an hour and a half. They say the President will speak after doing an airborne tour of the damage in New Orleans.
It looked like Nagin went on Marine One with him (good move). I would bet that Bush let Nagin blow off some steam during the last hour and they'll have peace in the valley now.
Like it or not, Nagin's the Mayor of the major city that was devastated and he'll be an important player over the next few weeks (or months). The people of New Orleans can't have him going off the deep end again.
Nagin's only avenue of redemption - would be to lay it all on Blanco.