WP 1.5 and Spam

I upgraded to WP 1.5 last night and since then my blog is being bombarded with spam. I’m talking about 40 spam comments and trackbacks per half hour, all of them having to do with poker or drugs. I’ve put all the key words and urls into the new blacklist feature, but it doesn’t do any good. The comments are still posted. I even have the trencaspammer plugin installed, which requires readers to entry a number code before their comment goes through, but the spam just isn’t being stopped! Is there anything else I can use to control this?