Network

Web server tools:

• http://news.netcraft.com, check out  on what software google etc..is running. This site has also some server server surveys.

Online tools: 

• http://www.dnsstuff.com, free tools for DNS and networking problems
• http://www.domaintools.com , another set of network tools like whois, domain search, ping etc..

Command line tools:

• IpConfig – for Win XP http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/ipconfig.mspx?mfr=true