Several members of Hillside Europe have written books on various topics. Here's a list of some of them. You can buy these books through normal book shops or through internet shops. Also, feel free to get in touch with the authors if you're interested in more information.

Frank Buschmann, Regine Meunier, Hans Rohnert, Peter Sommerlad, Michael Stal
Pattern-Oriented Software Architecture, Vol.1 -- A System of Patterns.
John Wiley & Sons, 1997.

James O. Coplien
Advanced C++. Programming Styles an Idioms.
Addison-Wesley, 1991.

James O. Coplien, Douglas C. Schmidt
Pattern Languages of Program Design.
Addison-Wesley, 1995.

James O. Coplien
Multiparadigm Design for C++.
Addison-Wesley, 1998.

James O. Coplien, Neil Harrison
Organizational Patterns of Agile Software Development.
Prentice Hall, 2004.

Jutta Eckstein
Agile Software Development in the Large -- Diving into the Deep.
Dorset House, 2004.

Wolfgang Keller
Enterprise Application Integration.
dpunkt.verlag, 2002.

Michael Kircher, Prashant Jain
Pattern-Oriented Software Architecture, Vol.3 -- Patterns for Resource Management.
John Wiley & Sons, 2004.

Andrew Longshaw, Paul Dyson
Architecting Enterprise Solutions -- Patterns for High-Capability Internet-Based Systems.
John Wiley & Sons, 2004.

James Noble, Charles Weir
Small Memory Software -- Patterns for Limited Memory Systems.
Addison-Wesley, 2000.

Linda Rising
The Pattern Almanac 2000.
Addison-Wesley, 2000.

Mary Lynn Manns, Linda Rising
Fearless Change: Patterns for introducing New Ideas.
Addison-Wesley, 2004.

Andreas Rüping
Agile Documentation -- A Pattern Guide to Producing Lightweight Documents for Software Projects.
John Wiley & Sons, 2003.

Douglas C. Schmidt, Michael Stal, Hans Rohnert, Frank Buschmann
Pattern-Oriented Software Architecture, Vol.2 -- Patterns for Concurrent and Networked Objects.
John Wiley & Sons, 2000.

Markus Schumacher
Security Engineering with Patterns.
Springer 2003.

Markus Völter, Alexander Schmid, Eberhard Wolf
Server Component Patterns.
John Wiley & Sons, 2002.

Markus Völter, Michael Kircher, Uwe Zdun
Foundations of Enterprise, Internet, and Realtime Distributed Object Middlware.
John Wiley & Sons, 2004.

Markus Schuhmacher, Eduardo Fernandez-Buglioni, Duane Hybertson, Frank Buschmann, Peter Sommerlad
Security Patterns. Integrating Security and Systems Engineering.
John Wiley & Sons, 2006.

Dragos Manolescu, Markus Völter, James S. Noble
Pattern Languages of Program Design 5.
Addison-Wesley, 2006.