If I could just be a touch sycophantic for a second: I'm actually REALLY impressed at how good News.YC is at deflecting spammers. I have a super low-traffic blogger blog and I see more spam there than I see on Hacker News.
I think that the fact that so many have said "YC got it's first spammer" so many times, is such a good testament to how fast spammers are dealt with. Thanks!