Far be it for us little guys to complain, but there have been two big time spam guys that have made it through your filter in the last week or so.  First was the Yong Dong guy, and now this meili guy.  On my recent posts screen there were 14 posts by this guy in less than 2 minutes.  I didn't open all of them, but I'd guess they were all identical. 

Why is it that I can't post to two topics with one liners in 5 minutes without having to fill out that captcha thing, but these folks can put up 10+ identical posts in 2 minutes?  Something tells me your filter needs changed.