OK let's start the speculation of who is on the list.
Bonds, Sheffield, Giambi, Bagwell, Vladimer Guerrero, ARod, Everett, Juan Gonzales would probably be a good starting point.
Agree on Bagwell - he looks thinner this year but blamed it on not being able to exercise as much in the off season (due to shoulder problem). On the other hand, he is smacking the ball around this year already...