"Python Geospatial Development" by Erik Westra (URL) provides a good introduction to geospatial development with Python. Python is ideal for "swiss army knife" geospatial operations, but the book concentrates on the development of applications including geospatial databases and Django-based geospatial web applications.

OpenStreetMap: Using and Enhancing the Free Map of the World by Frederik Ramm, Jochen Topf, and Steve Chilton is a good introduction and overview of the OpenStreetMap (OSM) project. Unlike most OpenStreetMp overviews, this book goes into a useful amount of detail covering subjects such as the data model, how to edit the maps, and how to use OSM data in applications.

It is recommended for people who need to a good grounding in the OpenStreetMap data format, and especially those who intend to be active participants. Those who wish to use OpenStreetMap data in their own applications, may find the book is only a starting point.

"Beginning Spatial with SQL Server 2008" by Alastair Aitchison is a good introduction to the geospatial features introduced in SQL Server 2008. It is primarily aimed at developers who have SQL Server experience but with limited or no geospatial experience. It is recommended for such developers who wish to build a geospatial database, or to use SQL Server as the backend database for a geospatial web application.