Interesting article over at CollyLogic -- by styling a:link/visited using background images nefarious web content providers can easily track which links you've visited by watching what images are requested along with the web page. Sneaky ... It's common practice to track "click throughs" with a redirect script or cookie and possible to abuse client-side scripting to the same end. Tracking a:visited background images is different because you can't turn it off (without disabling images or imposing a user stylesheet) and it (potentially) provides a peek into your browser history whenever you visit a page that contains a link to the same URL. Is it worth worrying about? Probably not ... but worth being aware of ("they" have many ways of watching you!)
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