1) Understanding Myself, A kid's guide to intense emotions and strong feelings by Mary C. Lamia PhD, Magination Press
2) Being Me, A kid's guide to boosting confidence and self-esteem by Wendy L. Moss PhD, Magination Press
3) 101 Success Secrets for Gifted Kids by Christine Fonseca, Prufrock Press
4) The Gifted Kids' Survival Guide for ages 10 & under by Judy Galbraith M.A., Free Spirit Publishing
  I just picked up #1 from the library yesterday for DD9 - I haven't even given it to her yet.  It looks good from a quick look-through, though.  She adores 101 Success Secrets for Gifted Kids, too.
I like the American Girl emotions book.  I think it's called "The Care and Keeping of My Emotions" or something like that.  DD9 enjoyed The Care and Keeping of Me and also that one.