Script Daddy

It's just like hardwire (NSF) once famously observed, and I'm paraphrasing here, "This stuff has gotten so easy all you gotta do is load up metasploit on your laptop, shove your laptop in your backpack and take a walk around your neighboorhood pwning networks as you went. Your grandmother could do it."

"The goal is to provide useful information to people who perform penetration testing, IDS signature development, and exploit research. This site was created to fill the gaps in the information publicly available on various exploitation techniques and to create a useful resource for exploit developers. The tools and information on this site are provided for legal security research and testing purposes only."

http://www.metasploit.com/

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"What is it?

The Metasploit Framework is a development platform for creating security tools and exploits. The framework is used by network security professionals to perform penetration tests, system administrators to verify patch installations, product vendors to perform regression testing, and security researchers world-wide. The framework is written in the Ruby programming language and includes components written in C and assembler.

What does it do?

The Metasploit Framework consists of tools, libraries, modules, and user interfaces. The basic function of the framework is a module launcher, allowing the user to configure an exploit module and launch it at a target system. If the exploit succeeds, the payload is executed on the target and the user is provided with a shell to interact with the payload."

http://framework.metasploit.com/

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A great video.

Man, I really have to learn how to do this stuff.

edit:
You might want to take a look at nmap also.