We did not consider adopting from Thailand; however, my mother in law who returns home several times a year had other plans. Most children who are eligible for adoption in Thailand are over the age of three and would likely be 4 or 5 before arriving home; most have special needs, may be minor and correctable with surgery. Many people who have adopted successfully from Thailand are Scandinavian, as it is a huge holiday destination for them. Both parents MUST travel to Thailand and stay the duration of the process. I would only consider a very established program who has a strong relationship with Thai officials and can place you in contact with other families for reference.
Hopefully this website can help provide some information.
http://www.neiu.edu/~rghiggin/Thaiadopt/start.html