How Google and other companies trade their products for your information.
Why does Google need my info?
Microsoft: control ad preferences
Tips for controlling the ads that Windows displays.
HTML5 Gendered Advertising Remixer
The Gendererd Advertising Remixer app lets you re-combine video from ads directed at boys with audio from ads directed at girls (and vice versa) to create hilarious and insightful fair use mash-ups!