It was time to end the show so I didn’t get to say it, but I don’t entirely agree with Matt’s last point. Though I seriously doubt Luis Castillo or Ollie Perez has much to offer the Mets’ 2011 roster, I don’t see a good reason to cut them before Spring Training unless the team desperately needs the 40-man roster space (which seems unlikely).
Outside of pissing off fans, there’s no real risk involved — both players will be paid regardless of what happens — so even though the potential reward seems marginal at best, they might as well give Ollie and Castillo the chance to show that they’ve returned to form. And yeah, we’re all nearly certain that won’t happen, but as long as the team is willing to identify them as sunk cost and cut them when the time comes, I’m not sure it hurts anything to have them in camp.
Does it send the wrong message to the other players? Maybe, but only if Alderson and Collins don’t communicate that there are open competitions at second base and in the starting rotation and bullpen, and that contracts won’t factor into who wins the jobs.
If Alderson can trade them, of course, then good riddance. But, you know, good luck with that.
Tedquarters 
I never heard Matt recommend either Castillo or Perez be cut prior to Spring Training. Nor were either of them ever mentioned by name.
A healthy Luis Castillo still has some value, notably as a player who can still get on base at a reasonable clip when healthy. It sounds like he will still be competing for the 2B job with Daniel Murphy (unless the club makes a trade) come Spring Training 2011.
Oliver Perez, less so, but there’s absolutely zero reason to cut him until he shows up in spring training and see what he’s got left. Probably nothing, but before you burn $12 million, you better be damn sure that he’s still a liability. Some pitchers have indeed been able to rebound from disaster, though they are the exception to the norm.