1. Microsoft: IIS, Active Directory, DNS, Exchange Server, PKI certificate management
2. SQL: SQL 2008, Postgre, mySQL
2. Network: SonicWall, ASA, 6500, 2950s
3. Linux: CentOS, Debian
4. Virtualization: VMware, HyperV
5. VoIP: Shoretel, Asterisk
 
Programming: Perl, Python, or Ruby. Some C
Diagram: Visio, openOffice
Get Organized: Trello, TFS, Git, etc