Well someone has to eat and if you look closely at what it has, it appears to be the remains of a goldfinch.
(http://i703.photobucket.com/albums/ww32/Owdboggy/January2010/Crow1.jpg)
From the other side.
(http://i703.photobucket.com/albums/ww32/Owdboggy/January2010/Crowsmall.jpg)
Would this be carrion, Palustris? The bird looks frozen, doesn't it.....wonderful pics as usual.
Crows will kill a sick bird, but they wouldn't be able to catch a healthy one. It was probably either dead or dying.