The Diamondbacks are three games back with over 90% of the season remaining, so it'd be silly to write them off. Still, let's take a look at who they might make available in trade if they're out of contention a few months from now.
Brandon Webb, coming back from shoulder surgery, isn't eligible to come off the disabled list until May 25th. Barring a setback, he should have a month's worth of big league starts before the trade deadline. If he's able to conjure up vintage Webb, he'll have plenty of suitors. But as we saw with Erik Bedard in years past, there are no guarantees he'll have trade deadline value.
Catcher Miguel Montero should return from knee surgery before the end of May. Chris Snyder could be placed on the trading block once again, if Montero shows no ill effects. For his part, Snyder has several weeks to prove himself as a healthy starting catcher. He's owed $11.25MM for 2010-11.
Adam LaRoche, Chad Qualls, Aaron Heilman, Bob Howry, Kris Benson, and Rodrigo Lopez will be eligible for free agency after the season. The D'Backs could move the majority of them if things are looking bad come July. LaRoche might fetch something useful. Augie Ojeda is under team control for 2011, but would probably be available as well.