Good Gear Guide
Seven secret weapons for network management on a b...
I like using Backtrack 4 to help me perform security assessments. It contains a large repository of tools that a penetration tester would need such as Metasploit Framework 2 & 3, SNORT, many others. Backtrack 4 organizes the tools into categories that relate to the security assessment methodology. It would take you a long time to put together such an extensive collection of tools on your own.
Seven secret weapons for network management on a budget