Gowalla has released an update to its iPhone and iPod touch app in conjunction with a major revamp of the location-based social network. Completely redesigned, Gowalla 4.0 promises to deliver a new and re-imagined experience for users centered around a new Social Guides feature that provides a collection of the best sights and venues in cities, parks and regions around the world. The Guides are currently available in 60 cities with plans to rapidly…
