An adoption can be either open or closed.
And open adoption allows identifying information to be communicated between adoptive and biological parents and possibly interaction between kin and the adopted person. Open adoption can be an informal arrangement subject to termination by adoptive parents who have sole authority over the child. In some jurisdictions, the biological and adoptive parents may enter into a legally enforceable and binding agreement concerning visitation, exchange of information, or other interaction regarding the child. As of February 2009, 24 U.S. states allowed legally enforceable open adoption contract agreements to be included in the adoption finalization.
In a closed adoption, the parties seal all identifying information, maintaining it as secret and preventing disclosure of the adoptive parents’, biological kins’, and adoptees’ identities. But a closed adoption may allow the transmittal of non-identifying information such as medical history and religious and ethnic background.
General Information: http://www.adoption.org/
Choosing an Adoption Agency:
Open Adoptions: http://www.openadoption.org/
Overseas Adoptions: http://www.childwelfare.gov/pubs/country_resource_lists.cfm
Adoptions for Gay Couples: http://itsconceivablenow.com/adoption-agencies/