References - Blocking - SQL Server optimization

Microsoft KB, TechNet:
-- How to resolve blocking problems that are caused by lock escalation in SQL Server
http://support.microsoft.com/kb/323630/en-us
-- Lock Escalation (Database Engine)
http://msdn.microsoft.com/en-us/library/ms184286.aspx

-- Minimize Blocking in SQL Server
http://technet.microsoft.com/en-us/magazine/cc434694.aspx


Other sites:

-- Troubleshoot SQL Server Locking
http://www.nwsummit.com/tech/mssql.html