I was recently searching for links to many of the Microsoft Posters that are available in PDF format.  These posters are usually very large and can be printed out either on a printer or taken to a store like Kinko's or the UPS Store to be printed on poster paper.  This list will change or get added to as I find new posters or the links change.

Posters:

1. Exchange 2007 Component Architecture
2. Windows Server 2008 Components
3. TechNet Active Directory Jigsaw
4. Windows Server 2008 Active Directory Components
5. .NET 3.5 Namespace Poster

Again, most of these posters are meant for printing on paper large than 8.5x11.

-Brent