The March 21, 2008 issue of Entertainment Weekly has an article on American Idol. It gives odds on the AI winner:

Kristy Lee Cook is at 500-1
Chikezie is at 250-1
Amanda Overmyer is at 100-1
Syesha Mercado is at 25-1
Ramiele Malubay is at 20-1
Michael Johns is at 15-1
David Hernandez is at 12-1
David Cook is at 10-1
Brooke White is at 8-1
Carly Smithson is at 5-1
Jason Castro is at 7-2
David Archuleta is at 2-1

This is on pages 31 through 32.

Think they have many of these wrong, but we will find out soon enough. Their 12-1 pick David Hernandez is already gone. I would be surprised if Jason Castro lasts more than a few more weeks.