EC2 Cloud computing setup (incl. EC2 API scripting)
Virtualization (Xen, Vmware esxi)
Sites/Servers migration (Wordpress, plesk, directadmin, ispmanager, ispcongif, webmin, cpanel etc.)
Shared file systems (nfs, gfs)
Server security (filters on ports, traffic redirecting, routing, source routing, load balancing, flood protection DDOS)
Routing (source routing, statics, dynamics, rip, ospf, bgp)
Server performance optimization (Apache, Nginx, MySQL)
Mysql tuning - scripting tuning and tweaking for hardwear as well as for the load, etc.
Email (postfix+dovecod, exim, sendmail, qmail)
Backup, shell scripts, etc.
Win 2003\2008 - Active Directory\Terminal Server\ IIS \ Exchange \DNS \ WINS \ Mssql \ - setup, migration