Ditto Diana! She always has great advice.
Another thing to add - I learned to tell my boys that when they were toddlers, I spent a lot of time with them. Keeping the safe, keeping them occupied, loving them, helping them with various things. The kids don't remember being toddlers so it's important to let them know that when they were 1-2 yrs old, they received the same amount of time, dedication, love and support as the new family member. My boys didn't get jealous. They just had to become more patient.
I live in an area that isn't blessed with diversity. So we talked a lot about diversity and how lucky we are to have 2 cultures in our home. We also discussed what other kids might say and that they may or may not intend to be mean and what a proper reaction would be. My boys are older though - 8 and 10 when we brought Mia home.
Chris and Terri - parents of Matt, Mark & Mia - Gotcha 12.15.09