Oooooh, one of my favorite topics!
I really liked:
"Raising Adopted Children" by Lois Ruskai Melina
"A Love Like No Other" by Pamela Kruger and Jill Smolowe
"Secret Thoughts of an Adoptive Mother" by Jana Wolff
"Twenty Things Adopted Kids Wish Their Adoptive Parents Knew" by Sherri Eldridge
I really want to read "The Girls Who Went Away" by Ann Fessler.
tapestrybooks.com has TONS of suggestions!