AdventureWorks is a very important database in SQL Server 2005 because it (a) is designed to show you how to (correctly) use many of the new features in SQL Server 2005 (as befits a sample database from Microsoft), and (b) it is used in most of the examples in the Books Online, and (c) because so many people use AdventureWorks in their demos! This video series walks you through the AdventureWorks architecture and tries to make sense of it all. AdventureWorks can be intimidating for someone new to SQL Server 2005 but, after watching this series of videos, you'll have a much stronger knowledge of the design and decisions in AdventureWorks.