--Perhaps there should be some ads right next to the text of these messages. Not sure about that.
--
Yes, but I think that would piss off people who got confused between the ads and the messages. I like the presentation here, they blend in with the page (style and color), but you aren't tricked into clicking on them instead of something in the forum.
And, yes, it does look like Google is doing an excellent job are showing relevant ads.
The fact that you noticed the ads and notice that they are right on topic is probably a good sign for the revenue on this site, even though they aren't smushed into the messages. That should also be a good sign for the people on the otherside (the advertisers) as they should get quality traffic as well.
Not sure if anyone will tell us whether we are right or wrong.