Chacon was totally expendable because Torre clearly didn't have a role for himm any longer, either starting or relieving, and Wilson is a versatile, above-average offensive player who can play several positions.
Suddelny the Yankees bench, which was definitely a weak spot all season, is much improved.
I think that there's one more move in the offing, though.
It looks like their 5 starters are RJ, Moose, Wang, Wright, and Lidle, with Mo, Farnsworth, Villone, Myers, and Proctor.
So if the carry 14 position players - which it looks like they will, that leaves Sidney Ponson as their 6th reliever.
I don't know if they're waiting for Dotel (how much longer can they wait?), or have something else in mind to replace Ponson in the pen.