By Caren Weiner Campbell
May 17, 2000 at 04:00 AM EDT

Sure, you love your beat-up 1980 El Camino, but just try selling it for more than $500 — especially since the rest of us can consult this online version of the famous resale guide. Thanks to a comprehensive database going back 21 years, we know your jalopy has a trade-in value of $515, but if you use the Virtual Walkaround to get a more accurate appraisal, you might turn into a used-car salesman we can trust.