It's not really a complete encyclopedia, so its probably a mistake that they've defined themselves that way. It's a collection of projects and its graphic design project is underdeveloped. The [[wiki]] concept seems to work great on the small scale. Take a look at the Battlestar Wiki for example.
I gave it a shot and dove in and did a small restructuring of the [[graphic design]] article. Like many graphic designers, I'd rather focus on my own projects than edit over there but I did my part. So here we are back on my site... Like I said, it's as easy as a Google search, but lets make it just a little easier. I've compiled a few resources and articles that give a nice overview of graphic design for further reading. What else should we see when we're giving an overview of graphic design past and present.
The Design from a German stamp. Courtesy of Wikimedia Commons
What is graphic design from Design Talkboard. Here's five definitions of graphic design to start with.
What is graphic Design? from Veerle's Blog. Commenters from around the web weigh in to create their own definitions of graphic design.
Trying to explain graphic design to a hall full of ten year olds from Johnson Banks, a London design consultant agency. Michael Johnson talks about his experience with kids and design.
A Brief History of Type by Thomas W. Phinney. Type is summed up through four major eras: Gutenberg, the Industrial Revolution, Photocomposition and the Digital era.
A Historical Timeline of Computer Graphics and Animation by Wayne E. Carlson.
THe History of Graphic Design and Its Audiences from the AIGA. Michael J. Golec talks about the lack of educational programs that focus on graphic design history. Most education in the field is career or studio driven.
History of Graphic Design by Nancy Stock-Allen. This is an educational site produced to assist in lectures, but it's very visually compelling and touches upon more points than I've seen on other sites I've looked at.
XIXth century advertising poster for the hydrotherapic baths of Bagnoles de l'Orne (France). Courtesy of Wikimedia Commons