Grid computing textbook:

[1] Grid Computing Making the Global Infrastructure a Reality, F. Berman, G. C. Fox and A. J. G. Hey editors, Wiley, 2003, ISBN 0-470-85319-0.
[2] The Grid 2, Blueprint for a New Computing Intrastructure, I. Foster and C. Kesselman editors, Morgan Kaufmann, 2004, ISBN 1-55860-933-4.
[3] Grid Computing,  J. Joseph and C. Fellenstein, Prentice Hall/IBM Press, 2004, ISBN 0-13-145660-1.
[4] Grid Computing: A Practical Guide to Technology and Applications, by A. Abbas, Charles River Media, Inc., 2004, ISBN 1-58450-276-2.

On-line books:

"Introduction to Grid Computing with Globus" by L. Ferreira et al, IBM Redbooks, Sept 2003. (Notice Globus section is on GT2.2)
"Globus Tookit 3.0 Quick Start" by L. Ferreira et al, IBM Redbooks, Sept 2003.

For Web Services:

[5] Building Web Services with Java: Making sense of XML, SOAP, WSDL, and UDDI, by S. Graham et al., SAMS publishing, 2002, ISBN 0-672-32181-5. Second edition, 2005, ISBN 0672-32641-8

For Cluster Computing:

[6] Parallel Programming: Techniques and Application Using Networked Workstations and Parallel Computers 2nd edition, B. Wilkinson and M. Allen, Prentice Hall, 2005, ISBN 0-13-140563-2.

Important Papers

"The Anatomy of the Grid: Enabling Scalable Virtual Organizations," I. Foster, C. Kesselman, and S. Tuecke, Int. J. Supercomputer Applications, 2001.
"The Physiology of the Grid: An Open Grid Services Architecture for Distributed Systems Integration,"  I. Foster, C. Kesselman, J. M. Nick, and S. Tuecke.