Following a post by Nelson Minar, I found the Network Advertising Initiative’s opt-out of tracking cookies page.
Unfortunately, I wasn’t able to set all the opt-out cookies from that interface, so I had to go to some of the individual advertising networks’ opt-out interface.
On BlueKai’s website, I was rewarded with this bit of passive agressiveness:

Yes, by opting out of tracking, I’m going to prevent a charitable contribution.
And if you’re from BlueKai, or their PR firm, don’t bother commenting to try to defend yourselves, because there really is no defense for that. Thank you for letting people opt out of your tracking, but your business isn’t saving babies, it’s ads and marketing data.
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