I haven't read these, so I don't know whether they're any good, but here are a few:
Perfectionism: What's Bad About Being Too Good by Miriam, Ph.D. Elliott, Mariam, Ph.D. Adderholdt, and Caroline Price
What to Do When Good Enough Isn't Good Enough: The Real Deal on Perfectionism: A Guide For Kids by Thomas S., Ph.D. Greenspon
Nobody's Perfect: A Story for Children About Perfectionism by Ellen Flanagan Burns and Erica Pelton Villnave
The Treasure Tree: Helping Kids Understand Their Personality by John Trent
I know the day is coming when I'm going to be needing these for my DS4.
