After battling Chinese spammers for the better part of the week, they switched to Korean. There are indeed filters in place, but that's not always going to stop a determined spammer. Threads removed, and I'll let doug chime in on any new checks put in place.
The thing about spam is that unless you have a paid person who's job is basically spam control, you're going to get a certain amount of spam (and even with a dedicated person there will still be a bit). This forum does an incredible job of keeping the spam down.
Of course. I'm not suggesting they aren't doing good work combatting spam. I just thought I would mention the possibility of using Google's reCaptcha button on a users first couple of threads or posts. It's an unobtrusive single click button.