Look at their updated privacy statement at: http://privacy.yahoo.com/privacy
About half-way down the page, in the section on cookies, you will see a link that says WEB BEACONS.
Click on the phrase “Web Beacons.” On the page that opens, find a paragraph entitled “Outside the Yahoo Network.”
In that section find a little “Click Here to Opt Out” link that will let you “opt-out” of their snooping. Be careful! not to click on the next button shown. It is an “Opt Back In” button that, if clicked, will undo the opt-out.
Note that Yahoo’s invasion of your privacy – and your ability to opt-out of it – is not user-specific. It is machine-specific. That means you will have to opt-out on every computer (and browser) you use.” (via Interesting People listserv)
Addendum: Ray Everett-Church:
