Web resources compatible with AD DS 2008 R2:
 

Extending the Schema
http://msdn.microsoft.com/en-us/library/ms676900(v=VS.85).aspx
 
What You Must Know Before Extending the Schema
http://msdn.microsoft.com/en-us/library/ms677995(v=VS.85).aspx
 
How to Extend the Schema
http://msdn.microsoft.com/en-us/library/ms676929(v=VS.85).aspx
 
Example Code for Extending the Schema Programmatically
http://msdn.microsoft.com/en-us/library/ms676735(v=VS.85).aspx
 
Obtaining a Root OID from an ISO Name Registration Authority
http://msdn.microsoft.com/en-us/library/ms677621.aspx
 
Obtaining an Object Identifier from Microsoft
http://msdn.microsoft.com/en-us/library/ms677620.aspx
 
Generates an object identifier (OID) using a GUID and the OID prefix 1.2.840.113556.1.8000.2554 (script)
http://gallery.technet.microsoft.com/ScriptCenter/en-us/56b78004-40d0-41cf-b95e-6e795b2e8a06
=> do not use  oidgen.exe and uuidgen.exe !!!