Over at bybido there is a tutorial for pigtail doll hair using wool. This is what it looks like...

Tantehilde makes gorgeous rag dolls and provides a tutorial for making doll hair for girls and boys. As I'd love to branch out into making boy dolls, this tutorial for the boy's hair would be ace to follow.
Meike over at the Crafty Sheep provides a tutorial for creating hair for Waldrof Dolls. I think this kind of hair would be adorable on my dolls too.