The Center for Democracy & Technology (http://opt-out.cdt.org/featured) has a great site that enables you to opt out of 14 major Web portals and online profilers (MSN, Wired, Yahoo, American Express, Any Birthday, AT&T, eBay, Amazon, 24/7 Media, AvenueA, BeFree, CoreMetrics, DoubleClick, and MediaPlex) in about twice as many mouse clicks. The site also offers savvy advice about online privacy.