Mike Gerra authored an in-depth report on Geo-Services: Trends, Challenges and Implications for Travel. It can be purchased via Phocuswright.
The synopsis from Phocuswright:
The ubiquitous availability of digital geographic information, combined with recent developments in mobile technologies, low-cost content publishing and widespread social networking have brought signi cant change to the world of geographic information systems (GIS) and mapping. For travel marketers and consumers, in particular, these geo-services present a unique set of bene ts and challenges.