I actually coded/designed the page. And oh man... the answer to that is even geekier...
Uhm. So, in the very very very beginning, pre-comic, when the game was still a medieval RP, I did a ton of maps, and designs. The background is actually a photograph I took of my role playing stuff (at the very bottom you can see a little of a character sheet as well) and the little shiny things are counters. So, it is A map of a medievally place, just not Tolkein's.
This is the full image, where you can see it a little better.
It's about fluff, angst, drama, comedy, gaming. Come play in our world.