Mike Pindelski over at Beyond the Box Score takes a look at the PECOTA projections of Carlos Zambrano:
http://www.beyondtheboxscore.com/story/2007/4/13/81153/7909
They are a little pessimistic about workload and control, noting that Carlos is one of the most overworked pitchers of the last few years. I've been wondering about this as well, especially about control. He hasn't shown any sign of being able to rein in his walk rate (4.84 BB/9 last year, 4.12 BB/9 career through 2006), which doesn't compare favorably at all to many other power pitchers of note.
That's why (I'm sure I'll get booed for this) I think Hendry should be careful in considering length of contract and compensation. I know contract talks have quieted down with the impending sale of TribCo., but I wouldn't want. to sign Z to anything longer than a 5 year contract considering his previous workload and control issues.