News to me, anyway.
If you belong to ANY Yahoo Groups ,be aware that Yahoo is now using "Web Beacons" to track every Yahoo Group user.
It's similar to cookies, but allows Yahoo to record every website and every group you visit, even when you're not connected to Yahoo.
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.
Please forward this to your other groups. You might complain, too, but I'm not sure if anyone is listening..