SQL Server 2008 R2 System View Map
Microsoft have a brilliant poster showing all the different system views which are available in SQL Server 2008 R2. The views are split into different sections (Endpoints, Spatial, Indexes etc) and all the relationships between the tables are shown. It’s really useful if you need some meta-data or just want to see what’s going on. It’s available in either PDF or XPS format, and can be downloaded directly from Microsoft here: SQL Server 2008 R2 System View Map