The fine folks over at Testking.com have created and shared an info-graphic that displays the power of WordPress. The image contains interesting information that can be found within the Codex but has been displayed in a nice, visual form. Notables include: time line of releases and major milestones from 2003 to 2010, web usage of WordPress, percentages of websites using different versions of WordPress, daily user activity and much more. Some of this information seems to be WordPress.com based so keep that in mind. Despite the information at some point being dated, this would still make a great snapshot to use as a poster.
The Power of WordPress by Tech King