please specify what model/version you're using/running at work. just want to have a general idea what's on the market right now.
1. client...ie: xp, mac os x
2. server...redhat 6, win2008 r2
3. mail server...notes 8, exchange 2010
4. mail client..outlook
5. mobile devices...blackberry, pda
6. ticketing system....remedy, landesk
7. hardware firewall....sonicwall, juniper
8. ips
9. ids
10. router
11. switch
12. virtualization
13. web server
14. database server
15. vpn
16. remote tools
17. antivirus
18. network monitoring
and anything else hard/software u want to add.