I feel like I'm going nuts because I swear this is what the book was called. I picked it up once at my local library years ago (around 2001, roughly). It was part of a series of fantasy books, young adult fantasy I believe, and it was very interesting and wittily written.
I remember a character (female, I think) travelling with a severed head that was enchanted to still be alive, and talk. There was a crow with the head, and he was a pretty sassy bastard, and I think they were all on a quest to reunite the head with its body but I can't be sure.
Sorry, I know that's not much to go on, but I've had a burning desire to read this series remembering how interesting it looked when I was younger. Dunno why I put it down in the first place.
I recall the cover vividly (it was a paperback). It featured the crow, with the girl standing in a background of long golden grass.