I always go to barnesandnoble.com to search (maybe that's b/c we're a member & get discounts though

). Anything by Lois Melina is great like Rachel said. I have all China books right now (although I'm trying to convince DH to let me buy more adoption books right now not all on China) so I haven't read any others.
Here's what I have on my list:
Born in Our Hearts : Stories of Adoption By: Filis Casey, Marisa Catalina Casey $8.96 @ Amazon
Child of my Heart: A Celebration of Adoption*By: Barbara Alpert*$10.80 @ Barnes & Noble
Raising Adopted Children By: Lois Melina $10.46 @ Amazon
Twenty Things Adopted Kids Wish Their Adoptive Parents Knew By: Sherrie Eldridge $11.16 @ Amazon
Not really sure how long these books are or how great they are but the reviews are great, that's why they're on my list.
HTH's!
Traci