Microsoft has published SQL Server 2008 System Views Poster. This poster should be must have poster for any SQL Server Developer. I have this poster on my wall. If you have extra copy of this postered in print. Do send it to me and I will forward it to developer who are very good but can not afford to get this poster printed in glossy pages.
The Microsoft SQL Server 2008 System Views Map shows the key system views included in SQL Server 2008, and the relationships between them. The map is similar to the Microsoft SQL Server 2005 version and includes updates for the new and updated the Microsoft SQL Server 2008 features such as resource governor, extended events, full-text search, and others.
This is must have poster for every Database Developer and Database Administrator.
[Download is removed as new version of SQL Server is released]
You can find additional popular SQLAuthority Downloads Best SQL Server Downloads List.
Reference : Pinal Dave (http://blog.SQLAuthority.com)