I'd recommend you think about what Alexander says about placement. I've placed my Google AdSense ads near the top of the page, and have gotten a number of clicks from this area. While I can't say whether or not it's really based upon placement (I'm not going to move them to the bottom - thanks ) looking at your forum I find the AdSense links to be buried. I see Pages: 1 and stop right there - maybe letting my eyes wander to the dropdown.
If you are going to keep the ads way down under, I recommend you change the style of the ads. I can't speak for style for higher placement, but since I'm arguing that I can't see the ads now, one way of making them stand out would be a different style ... If you move them up, then that may change.
Of course, the problem with moving the ads up is that the current flow is quite nice. Since you've got a huge top image, adding anything more before your forum is going to cause problems (on 1024x768 and Firefox, I can see only the first post in your forum, and on 800x600 I can see nothing past Le Forum).
May I suggest that you resize/combine "Le Forum" and "Talk about how good we are in here" (keep them on two lines, but either decrease the space between them and/or resize the font).
Of course, if you're stats say that your users use 1280x1024 primarily, then disregard my comments, as your site looks pretty nice in that resolution.
(And your styles/colour scheme look great in any resolution, by the way - very nice.)
~James