Welcome.
Soon the content will start rolling in, for the time being you can find some online tools in the Tools Section,
tools such as an Online Nslookup, Facility to ping servers / computers, Port Scanner , Traceroute facility, a GeoIP tracking facility, telling you which country an ip address is located in.
Soon i will upload Tutorials and a few linux commands in the Linux section.
In the Virtualisation section some scripts to Add functionality to XenServer
Also Some Scripts to help you take advantage of Amazon Ec2 will follow
Cheers