veryone's got at least one great cab story. But not everyone's ridden in The Ultimate Taxi. This Aspen, Colorado-based traditional Checker cab is equipped with a laptop PC, wireless Internet connection, light show, dry ice, mirror ball, and compact MIDI recording studio. The site is lo-tech but hi-cheese: standard animation gimmicks propel a cab back and forth across your screen, and 3-D glasses are needed to best view content. An onboard Kodak digital camera allows passengers to have their picture taken and "beamed up to cyberspace" using GoGadget administration software created by Internet Direct. According to cabbie Jon Barnes, it's the only software for "safe Web publishing while driving a car" (and you thought cell phones were dangerous). Just don't get out of the cab before you've checked out the online gallery of such celebrity fares as Ringo Starr, Jerry Seinfeld, and Clint Eastwood. Send live email to the cab - and don't forget to ask for a receipt.