Heh, yeah you found a glitch there. I thought it limited the height to 800, apparently not.
There is a new Arcade in the works, but I don't think there's a timeline set yet on it's completion. Apparently it was put on hold for the Forum upgrade, which I'm sure was required because of it's interactions with the User accounts.
Just noticed the graphics in that post didn't upgrade with the forum well. (at least not in my browser.)
Drag the graphic and drop it in the address bar to view it as it's own page, and you can see the whole thing.