I've been deleting threads like mad for the last week and a half; we've brought the issue to Admin and he said he's going to do something about it.
For now, if anyone out there sees a spam thread that's more than about 12-24 hours old, PM a mod and we'll deal with it. Anything under 12 hours just leave it alone and we'll probably get to it. There's been a lot of spam coming in and while we want to get all of it, it wouldn't help for us to be getting tons of PMs pointing out spam threads. Just point out the ones we miss.
Hopefully this problem will be dealt with soon and none of us will have to worry about it anymore.