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Sunflux - 4:45 am on Aug 27, 2004 (gmt 0)
I'd guess it 1) blocks ads with certain keywords in the ad text and/or 2) blocks ads that target specific keywords (in ADDITION to the ones that are causing it to appear on your site). There are several off-topic keywords I would **LOVE** to block - blocking the specific URLs does no good, since there seems to be an endless supply.
Oh, oh, oh! Sounds great.