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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 regarding "relevant advertising" at http://info.yahoo.com/privacy/us/yahoo/

Here's the link for removing the web beacons  ----------> http://privacy.yahoo.com/privacy/us/beacons/details.html

In that section find "opt-out of interest-matched advertising" link that will let you "opt-out" of their snooping.
Click it and then click the opt-out button on the next page.

*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.

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Web pages may contain an electronic file called a web beacon, that allows a web site to count users who have visited that page or to access certain cookies. Yahoo! uses web beacons in the following ways:

Within the Yahoo! Network

Yahoo! uses web beacons within the Yahoo! network of web sites in order to count users and to recognize users by accessing Yahoo! cookies.
Being able to access Yahoo! cookies allows us to personalize your experience when you visit Yahoo! web sites that are located both on and off of the yahoo.com domain.
Outside the Yahoo! Network

Yahoo! uses web beacons to conduct research on behalf of certain partners on their web sites and also for auditing purposes.
Information recorded through these web beacons is used to report anonymous individual and/or aggregate information about Yahoo! users to our partners. Aggregate information may include demographic and usage information. No personally identifiable information about you is shared with partners from this research.
When conducting research that collects personal information Yahoo!'s practice is to require partners to disclose the presence of web beacons in their privacy policies and state what choices are available to users regarding the collection and use of this information. You may choose to opt-out of Yahoo! using this information.
Note: This opt-out applies to a specific browser rather than a specific user. Therefore you will have to opt-out separately from each computer or browser that you use.

HTML Mail

Yahoo!'s practice is to include web beacons in HTML-formatted email messages (messages that include graphics) that Yahoo!, or its agents, sends in order to determine which email messages were opened and to note whether a message was acted upon.
In general, any file served as part of a web page, including an ad banner, can act as a web beacon. Yahoo! may also include web beacons from third parties and affiliates within pages served by Yahoo! so that Yahoo!'s advertisers may receive auditing, research and reporting.