Slashdot | New Technique for Tracking Web Site Visitors: "According to Jupiter Research, 58% of web surfers deleted cookies from their system in 2004. This has sent a loud message to marketers in regard to consumer's preference as to tracking their online activities. The marketers have responded with PIE. Persistent Identification Element (PIE) is a technology that uses Macromedia's Flash MX to track you even without using cookies. Macromedia has created a page to instruct users on how to disable this."
