Data Center Design and Implementation (UPS needs, HVAC design, environmental monitoring, structured cabling, co-location design, DR site implementation, vendor management)
Cloud infrastructure design and implementation, especially with:
AWS
Rackspace
Joyent
Deep level network inspection (Wireshark, WinPCAP)
Enterprise monitoring solutions
Hyperic
Nagios
Splunk
Project and bug management tools
JIRA, Confluence and the Atlassian suite
Bugzilla
MantisBT
Network and systems security
IDS platforms
Patch management and endpoint management (Tivoli, JAMF, Nessus)