The Short Topics in System Administration books provide information not available elsewhere. Presenting topics in thorough, refereed fashion, they are small enough and flexible enough to grow with the community.

#26 Modern Infrastructure Engineering with CFEngine 3
Mark Burgess and Diego Zamboni
#25 Enterprise IPv6 Deployment: Experience Report from Google
Haythum Babiker, Irena Nikolova, and Kiran Kumar Chittimaneni
#24 Cloud Computing with VMware vCloud Director
John Y. Arrasjid, Ben Lin, Raman Veeramraju, Steve Kaplan, Duncan Epping, and Michael Haines
#23 A Sysadmin's Guide to Navigating the Business World
Mark Burgess and Carolyn Rowland
#22 Job Descriptions for System Administrators, 3d Edition Revised
Tina Darmohray
#21 Foundation for Cloud Computing with VMware vSphere 4
John Arrasjid, Duncan Epping, and Steve Kaplan
#20 Running the Numbers: System, Network, and Environmental Monitoring
Daniel V. Klein and John Sellens
#19 Configuration Management with Bcfg2
Narayan Desai and Cory Lueninghoener
#18 Deploying the VMware Infrastructure, Second Printing
John Arrasjid, Karthik Balachandran, Daniel Conde, Gary Lamb, and Steve Kaplan
#17 LCFG: A Practical Tool for System Configuration
Paul Anderson
#16 A System Engineer's Guide to Host Configuration and Maintenance Using Cfengine
Mark Burgess and Æleen Frisch
#15 Internet Postmaster: Duties and Responsibilities
Nick Christenson and Brad Knowles
#14 System Configuration
Paul Anderson
#13 The Sysadmin's Guide to Oracle
Ben Rockwood
#12 Building a Logging Infrastructure
Abe Singer and Tina Bird
#11 Documentation Writing for System Administrators
Mark C. Langston
#10 Budgeting for SysAdmins
Adam Moskowitz
#9 Backups and Recovery
W. Curtis Preston and Hal Skelly
#7 System and Network Administration for Higher Reliability
John Sellens
#6 A System Administrator's Guide to Auditing
Geoff Halprin
#5 Hiring System Administrators
Gretchen Phillips
#4 Educating and Training System Administrators: A Survey
David Kuncicky and Bruce Alan Wynn
#2 A Guide to Developing Computing Policy Documents
Edited by Barbara L. Dijker