How to create a penetration test lab

[jfvanmeter () comcast net]

Hello Every one, I was hoping I could get some input about creating a Penetration Testing Lab. I currently have the 
following:

ESXi Hosting the following viruals
XP Pro 
XP Home
Vista Home
Centos
Fodora
Unbuntu
Mepis
Several LAMP build
Windows 2000 IIS5
Windows 2003 IIS6

The network is setup using a couple of Cisco 2500 series routers, Catalyst 3524 switch and a Pix 506.

I have a laptop that I run, BackTrack 3 and 4, SamuriaWTF, etc

What I want to learn is shell coding, I have some background in assembler from my time working with mainframes. Can 
anyone think of  anything I should add? Suggestions on the best way to start? I have a couple of books that I'm using 
as a reference.

I look forward to hearing from everyone.

::John

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