It's amazing to me that the Cubs have done such a good job sabotaging Zambrano's value (through bad PR and the unnecessary bullpen debacle last year) that he is perceived as being close to immovable in a trade. If you list his accomplishments, he should be one of the hottest commodities on a potential trade market if the Cubs throw in a couple million dollars. 121-76, 3.53 ERA (39-21, 3.78 ERA over the last 3+ years). Never had an ERA over 3.95 in a full season. Compared to other pitchers, he adds real value with the bat in the NL. Even though he's been around for 10 years, he just turned 30 yesterday.
Yes, he has issues. But despite his on-field antics, his teammates have consistently said he's a good teammate behind the scenes. His craziness doesn't translate to the locker room like it does with Carlos Silva or Milton Bradley. I have no doubt that if the Yankees or Red Sox PR people were behind Zambrano, his faults would be perceived as nothing more than intensity and acceptable quirks for a player as productive as he is. And he'd be positioned as the marquee pitching name on the potential trade market in July.