has anyone got to the stage where they can post a forum topic about their game, maybe with a summary of what its about, and some concept art?
No, but it shouldn't take me more than a couple of weeks to get there.
Currently, my game consists of 2 textured 2D-rectangles moving a bit on the screen, with blending. Not much, i know. I'm now doing the input, and after that, I'll start adding game elements, and hope to get some screenshots then.
Something else, I don't think I'll include multiplayer. I'll try to add it later on, after I see my game actually would be fun to play multi. I don't know a thing about internet/lan connections, so I'll have to learn a lot about that, and I don't see me doing it before the competition ends. Also, I don't want to open-source a multiplayer game. It makes cheating way to easy. So I'll first make the singleplayer, release it open-source, then completely convert it to multiplayer, and release that as freeware.