Searching some documentation about SQL Server 2005 architecture I discovered this site:

http://www.microsoft.com/india/teched2006/presentations.aspx

Some of the sesions that I consider to be very interesting are:

SQL Server Monitoring Tools: The Key to Running 24x7 SQL

SQL Internals: Core Database Engine Changes in SQL Server 2005
 
Getting the Best out of your SQL Box: Performance Tuning SQL Server 2005

Using CLR inside SQL Server: Best Practices
 
Building Asynchronous Applications using SQL Server for Higher Reliability and Scalability

Data Access from Future: Language Integrated Natural Query

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Cristian Andrei Lefter, SQL Server MVP
MCT, MCSA, MCDBA, MCAD, MCSD .NET,
MCTS, MCITP - Database Administrator SQL Server 2005
http://sqlserver.ro