Recommended Mythology or Folk Tale Collections?

I'm looking for recommendations for collections of mythology or possibly folk tales for my daughter. She's 10 but a very strong reader; she enjoys pretty much anything through YA-level that isn't inappropriate content-wise. She's currently fascinated by mythology -- greek, because they are reading D'Aulaires' book of Greek Myths at school, and norse thanks to Marvel (sigh)

Any recommendations or favorite collections?