Google appears to be taking a harder look at SE spam with doorway pages...something that is definately a problem on their site. Special
interest at the moment seems to be on pages originating outside of the USA.

BMW Germany got zapped for this according to this article.

I do find it interesting that it mentions in the article that google is talking to BMW and that BMW feels they may be able to talk their way back in to search results..... try getting google to talk to you if you get banned for something you feel you did not do. Bet you won't have the same results as BMW!

And here is the Blog where a software engineer at google discusses the stance on this issue. I think I'll bookmark this guy's blog as a harbinger of things going on at google.