Chowhound is mentioned in the June 2007 edition of Shape magazine, but I couldn't find it in the online version. It is on page 52 as part of "An Insider's Guide - Dine Well on the Road"... here's what it says:
"Connect with fellow food lovers - Going to Philly and want to know where to get the best cheesesteak? Post your query on chowhound.com and other members will respond with recommendations. Use it for American cities and far-flung locales alike."
It is mentioned along with Happycow.net for vegetarian resources, eater.com for foodie gossip and menupages.com for menu information.