Windows Server 2003 Active Directory.............

Hi all,
This is my first mail to this forum. I am a It professional from Mumbai, India. I am working on microsoft windows server 2003 active directory infrastucture. we are about to implement it in our organization. I want to study it deeply. I have gathered few documents from internet. but seems not sufficiant. So i request you all, if possible please provide me the active directory related stuff.
thanking you all
have a nice time
regards
avadhut