I think it's very unlikely that Saddam was captured last night, from looking at the photos.
First off, the wound on his forehead has healed over between the time the "unshaved" photo was taken and the time the "shaved" photo was taken. Sure, I guess you could say that for some reason they put makeup on it.
But, more difficult to explain - he has more than a little stubble by the time the "shaved" photo was taken. That's no 5 o'clock shadow, even if you have a fast-growing beard. Looks more like at least a couple of days.
My interpretation is that he was captured on Thursday or Friday, but they didn't want it to hit the weak Friday news circuit. By announcing it Sunday morning, they made sure it (a) took that talk shows by surprise, (b) dominated the TV news on a day most Americans are home, and (c) will be on the front page of every newspaper on Monday, just in time for watercooler talk.
If he was captured a few days ago, this is yet another example of Bush administration lies to politicize the war.