Where will they be held?
Athens has seriouslky crapped up the situation like never before. At this late date, the olympic commitee must be looking at alternative venues. I’m guessing Toronto might get the nod, maybe LA. Maybe China?
I suspect China won’t get the 2004 and the 2008 Olympics. 
Can you provide a link to a story which suggests Athens won’t keep the Games?
As far as I know they’re not going to lose the games… where did you hear this, and when? The only thing I heard is that they’re taking longer than expected to get everything built, but they should have it all done in time. This is a link to a fairly recent CNN story about it:
http://edition.cnn.com/2003/WORLD/europe/08/09/athens.olympics.ap/index.html
That Athens is unprepared for Olympics is not news- it’s been obvious for some time that they’re well behind on construction of facilities and waaaaay behind schedule in arranging for security. More than 2 years ago, I read that Olympic committee representatives were secretly meeting with civic leaders in Sydney, Australia, trying to talk them into hosting the Olympics again, since there was no other city that had the infrastructure in place.
But if the Olympics weren’t moved then, it’s almost certainly too late to move them now. While the potential for a fiasco is very real, I don’t see any prospect of the Olympics being moved elsewhere.