Personalized travel guide will be offered as part of online ticket purchaseIn this segment, which takes place in Zaragoza, Spain, I caught up with San Francisco-based David Sifry, a five-time entrepreneur and founder of Technorati, a blog-search-engine-turned-advertising network. There's nothing like going halfway around the world to meet up with a fellow Bay Area entrepreneur. But it seemed appropriate to do an interview, given that Sifry's latest startup - Offbeat Guides - creates ...